Step-by-step installation of Vittoria basin mixer – error-free procedure

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Step-by-step installation of the Vittoria basin mixer – a mistake-free process

Replacing or installing a new basin mixer is one of those home repairs that seem simple – and in most cases they really are. However, if you skip a step, forget to tighten a connection or use the wrong gasket, the result can be a wet floor, a dripping cabinet under the sink or a mixer that starts to wobble and squeak after two years. Over the years of practice I have seen dozens of such installations – and the vast majority of problems had one common denominator: haste and skipping seemingly insignificant details.

This article will provide you with a complete step-by-step installation process for the Vittoria basin mixer Vittoria with a focus on real-life practice. We won't just scratch the surface – we'll also explain why each step is done exactly this way, what are the common mistakes and how to avoid them. Whether you are installing a mixer on a new sink or replacing an old one piece by piece, this guide applies equally.

What you need before starting the installation – preparation is half the success

A professional plumber never starts an installation without having all the necessary tools and spare parts at hand. It may seem obvious, but in practice, most people arrive at the sink with the mixer in hand and nothing else – and then run to the store three times. Avoid this.

Required tools and materials

Adjustable wrench or mixer installation wrench – so-called long-handled mixer wrench is invaluable when working in the confined space under the sink. A regular wrench usually simply won't fit there.
Flat screwdriver and cross-head screwdriver – for any securing screws and cover plates.
Gaskets – flat rubber washer (50 mm diameter, thickness 3–4 mm) – most Vittoria mixers include a gasket in the packaging, but it's good to have spares.
Teflon tape (PTFE) – for threaded connections. Use high-quality tape of width 12–19 mm.
Connecting hose G3/8" or G1/2" – depending on what shut-off valves you have installed. Standard length 30–50 cm. Vittoria mixers usually have inlet connections G3/8".
Torque wrench or at least a good feel in your hands – over-tightened connecting fittings are the second most common cause of leaks.
Flashlight or headlamp – it's dark under the sink in the cabinet.
Bucket or cloth – there will always be some residual water in the pipes.
Silicone or acrylic sealant – if the sink doesn't have a flat surface around the hole and needs to seat a gasket.

Before starting the work itself, read the manufacturer's installation instructions included in the packaging. Vittoria mixers usually have a concise but precise manual with specified tightening torque values and specific requirements for the given series. If you don't have it, you can find it on the website atria.sk/vittoria.

Closing the water supply – never skip this step

This may sound trivial, but it is the most common source of problems. Before any work on the mixer or connecting pipes, always close the water supply. In modern bathrooms, there are corner (ball or screw) shut-off valves under the sink – one for cold and one for hot water. Turn them 90° (ball valve) or turn them clockwise (screw valve).

If you don't have such valves – and this is not uncommon in older apartments – you will have to close the supply at the apartment manifold or at the main shut-off valve. After closing, open the mixer tap and let the residual water drain from the pipes. Only when the water has completely stopped flowing can you disconnect the connections.

Tip from practice: even after closing the valves, there is usually 0.5–1 dl of water remaining in the connecting hose. So have a cloth or bucket ready. Nothing bad will happen, but when working over a wooden cabinet under the sink, it can be unpleasant.

Removing the old mixer – what can surprise you

If you are replacing an existing mixer, you first need to remove the old one. The rule here is: the older the mixer, the more resistance. The connecting nut (so-called compression nut) under the sink can be corroded for decades and even a strong wrench won't move it easily.

Process for removing the old mixer

Disconnect the connecting hoses from the mixer connections (hold the hose with one hand, use the wrench to loosen the nut on the connection).
From the bottom of the sink, loosen the compression nut – the one that holds the mixer in the hole. It is usually plastic or brass, sometimes with a rubber washer.
If the compression nut is corroded or rusted, use penetrating oil (WD-40 or similar), let it work for 15–20 minutes, then try again.
Lift the mixer up from the sink hole. For some series, it is necessary to first remove the cover plate (decorative ring) that covers the mixer hole at the sink.

Note: on this occasion, always inspect the condition of the threads on the connections under the sink. If they are damaged or corroded, it's time to replace them before installing the new mixer – it will save you from later problems.

Preparing the hole in the sink and installing the gasket

The standard hole for a basin mixer has a diameter of 35 mm. Vittoria mixers are dimensioned for this diameter – the body of the mixer (diameter approx. 33–34 mm) will pass through the hole without problems, while the escutcheon, or the lower cover washer, will cover the entire hole.

Before inserting the mixer into the hole, the key step is preparing the gasket. Most Vittoria mixers are supplied with a rubber sealing washer that is placed on the neck of the mixer and, when the compression nut is tightened, is pressed against the upper surface of the sink. This washer prevents water from entering the interior of the sink or between the mixer and the ceramic surface.

If the area around the hole on the sink is not flat (for example, on older stone sinks or on sinks with an atypical shape), it may happen that the rubber washer does not seat tightly enough. In such cases, it is advisable to apply a thin layer of silicone sealant to the underside of the washer before installation. Not too much – just enough to fill any irregularities. Excess sealant should be pushed out and wiped away before it hardens.

Inserting the mixer into the opening and pre-assembly from below

This is the phase where you need to improvise a bit with the position of the body. Work in the space under the basin is cramped and ergonomically challenging – even more so with a high cabinet. You will be working from two sides: from above (mounting the mixer) and from below (tightening the locknut).

Exact insertion procedure

Put on the sealing washer on the mixer neck (the rubber washer with a hole fits exactly on the neck, or it is a plastic ring).
Insert the mixer from above into the opening in the basin. Pay attention to the correct orientation – the mixer outlet must point above the center of the basin, not to the edge or outward. For single-lever mixers, check that the lever can freely turn in both directions.
Hold the mixer with one hand from above in the correct position – or ask someone to hold it – while you work from below.
From below, put on a plastic or metal mounting washer (usually included in the package) and then the locknut on the output thread of the mixer neck.
Tighten the locknut by hand until it is fully seated, then tighten with a wrench. Do not over-tighten – for plastic nuts, tightening by about 1.5 turns with a wrench after manual tightening is sufficient. For brass nuts, you can go a bit tighter, but again not to maximum force.

Practical experience: a locknut that is too tightly tightened can crack the thin ceramics of the basin – especially with cheaper models. On the other hand, an under-tightened nut will cause the mixer to move and wobble with each opening. The correct torque is one where the mixer stands firmly and does not turn when strongly gripped, but the ceramics is not under stress.

Connecting the supply hoses – hot and cold correctly

Supply hoses connect the mixer to the angle stop valves. Standardly, braided stainless steel hoses with G3/8" ends (on the valve side) and G3/8" or G1/2" (on the mixer side) are used. Vittoria mixers mostly use G3/8" inlet connections.

Important: hot water is always on the left, cold water is always on the right. This is the European standard and is also followed by Vittoria mixers. If you mix them up, the mixer will work, but the lever will turn in the opposite direction than usual – and that will confuse every user.

Procedure for connecting the hoses

Check whether rubber seals are installed on both ends of the hoses (most hoses have them built into the nut). If not, add them.
Place the hose on the mixer connection and start tightening the nut with your fingers – never start with a wrench, as it may damage the thread.
When the nut can be easily tightened by hand for at least 3–4 turns, tighten it with a wrench. It is sufficient to tighten it by 1–1.5 turns with a wrench after manual tightening. For supply hoses with an internal rubber sealing insert, Teflon tape is not necessary.
Connect the other end of the hose (G3/8") in the same way to the angle stop valve under the basin.
Repeat the procedure for the second hose.

Where is Teflon tape used? On metal threaded connections without rubber seals – for example, if you were to directly screw the mixer thread into a threaded fitting without a hose. For standard braided hoses with rubber seals, Teflon is not necessary and some plumbers even do not recommend it, as it can cause the nut to not tighten evenly.

First test – pressure, tightness, function

Now comes the moment of truth. Before you close the cabinet and wash your hands, it is necessary to test the system. Do not underestimate this – most leaks will show up exactly at the first pressurization, and it is much easier to eliminate them now than a week later when you will be dealing with a wet floor and a swollen cabinet.

Testing procedure

Make sure the valve (or taps) of the faucet are in the closed position.
Slowly open the cold water corner valve – only a quarter turn. Wait 30 seconds and monitor the hose connection points (at the faucet and at the valve).
If you don't see any drops or condensation, open the valve fully.
Repeat the same for hot water.
Open the faucet and let the water run for 1–2 minutes – monitor the connection points.
Run your hand or a dry cloth along each connection. If there is any moisture anywhere, it is necessary to tighten or reconnect the hose.

If water is leaking from the threaded connection despite tightening: close the water, remove the hose, check the sealing and remount it. Never try to tighten a connection under pressure – damage to the thread is possible.

Tip: if you have water pressure in your home above 4 bar (which is common in panel buildings, especially on lower floors), it is advisable to check whether you have a pressure reducing valve installed. Vittoria faucets operate standardly in the range of 1–6 bar, but long-term higher pressure reduces the lifespan of internal components. More on this topic can be found in the article Water pressure and Vittoria faucets – what minimum pressure do you need for proper function.

Setting temperature and flow regulation – final tightening

After a successful leak test, the faucet setting follows. Most modern single-lever Vittoria faucets include an internal limitation of the maximum opening of the lever to the hot water position – so-called thermal limiter. This is a safety feature that prevents unintentional full hot water draw with one movement.

Setting the limiter depends on the specific model and is described in the attached manual. In general: if you have small children or elderly people in your home, set the limiter so that the maximum temperature at the outlet is 38–40 °C even when fully opened to the hot water side.

With two-lever faucets, no setting is required – temperature regulation is straightforward (one tap for cold, the other for hot water).

Finally, adjust the aerator (aerator) at the outlet. Most Vittoria faucets are delivered with an aerator, which has the option of flow regulation or is fixed. If you have installed the faucet after pipe reconstruction, where dirt or sealing pieces may have remained in the pipes, remove the aerator on the first day and flush it out.

Common installation errors and how to avoid them

Here I summarize dozens of situations I've seen on jobs – and they are also the most common customer questions when something doesn't work:

Forgotten sealing under the faucet – the faucet does not show a leak, but water during washing penetrates capillary between the faucet and the ceramic. Result: black mold around the socket and a wet cabinet. Always check that the sealing is properly installed and compressed.
Swapped connections – hot water comes out on the right, cold on the left. Functionally no problem, but the faucet lever works the opposite way. Especially with series with thermal limiter, this can be confusing.
Twisted connecting hose – the hose is twisted more than 360°, which leads to a leak at the nut or cracking of the braid. During installation, always monitor that the hose is not twisted – tighten the nut, the hose remains free.
Cracked compression nut – a consequence of over-tightening, typical with plastic nuts on cheaper basins. The faucet stands, but it easily pulls up during pulling. Solution: tighten compression nuts with care.
Missing rubber sealing in the hose connection nut – cheaply sold hoses sometimes do not have an internal sealing. Always check before installation. Without sealing, the connection will be leaky regardless of how tightly you tighten it.
Installation without closing the water – a schoolboy error, but it happens. The result can be dramatic, especially at higher pressure.

Special cases – installation into a sink vs. pedestal basin vs. built-in cabinet

The procedure described above applies to the most common case – a basin with an opening, accessible from below without major obstacles. In practice, however, we encounter various situations:

Pedestal basin

Pedestal basins have limited access from below due to the pedestal. Sometimes the pedestal is freely placed and can be removed, other times it is glued. Procedure: always pre-install the faucet before placing the basin on the pedestal – it will save you a lot of trouble. If you are replacing a faucet on an existing pedestal basin, check whether the pedestal can be tilted or removed. Most standard pedestals are just placed and held by the weight of the basin – they can be pushed aside.

Basin built into a sink / built-in cabinet

Here the space under the basin is hidden in the cabinet. Advantage: you always have space to store tools and have a clean working environment. Disadvantage: if the cabinet is full, you have to empty it. Access to the compression nut is usually good, but long faucet wrenches with a joint are invaluable here.

Wall-mounted basin mixer without cabinet

This is the technically simplest installation – you have access from all sides. The only complication: the supply pipe (usually chrome or copper) is visible, so the connecting hoses must also be aesthetically appropriate – braided stainless steel hoses are the ideal choice here.

Care for the mixer after installation – first steps

Right after installation, it is advisable to perform a few simple steps that will extend the lifespan of the mixer. During the first month, visually inspect the connection points at least once a week – sometimes a leak only appears after a few days, once the seal has settled into its new position. Check the connecting hoses for condensation or drops.

Wipe the surface of the mixer dry with a soft cloth after installation – fingerprints and liquid sealant are much easier to remove when they are still fresh. The chrome surfaces of Vittoria mixers are treated with a protective layer that resists common lime deposits, but aggressive cleaning agents (acidic polishes, abrasive pastes) can damage the surface. For more on care, see the article Cleaning and maintenance of Vittoria mixers – how to extend lifespan and preserve the shine.

If after a few months you notice dripping from the spout of the mixer with the tap closed, it is usually a worn cartridge or seat seal. This issue is solved by replacing the cartridge – the full procedure is described in the article Replacing seals and cartridges in Vittoria mixers – when and how to do it, or Dripping Vittoria mixer – causes and fixing leaks.

What to do if something goes wrong – troubleshooting directly during installation

The most common problem after installation: the mixer wobbles, rotates or shifts during normal use. The cause is almost always an under-tightened compression nut. Solution: turn off the water, disconnect the hoses, tighten the nut, reconnect and test again.

Another common case: water leaks from the hose thread despite tightening. Check whether there is a rubber seal in the hose nut. If yes and the leak persists, disconnect the hose, wrap the thread with one layer of Teflon tape and tighten again. If that doesn’t help, the hose may have a damaged seal – replace it.

A situation I have seen several times: the customer installed the mixer and after testing, water leaked from the bottom of the mixer body, not from the connections. This means either an internal mixer fault (internal seal), or a cracked body – in such a case the mixer is defective and needs to be returned. Vittoria mixers come with a guaranteed warranty period – details can be found in the article Common questions about Vittoria mixers – warranty conditions, spare parts and compatibility.

Technical specifications of Vittoria basin mixer – what is good to know

For correct selection and installation, it is important to know the basic technical specifications. Vittoria basin mixers are standardly dimensioned for:

Body diameter: 33–34 mm (for standard 35 mm hole)
Connecting hose thread: G3/8" (internal), or G1/2" in some series
Working pressure: 1–6 bar (recommended operating pressure 2–4 bar)
Water temperature: max. 70 °C at the inlet
Height of spout from the basin rim: standard 180–220 mm (depends on the series)
Flow rate at 3 bar: usually 8–12 l/min (with aerator)

Always check the spout height in relation to the depth of your basin before purchase. If the basin has a deep bowl, a lower spout will look unattractive and impractical. More on this decision can be found in the article Vittoria mixers: dimensions, connections and spout height – what to know before installation.

Most frequently asked questions (FAQ)

Do I need to use Teflon tape on the connecting hose threads when installing a Vittoria mixer?

No, if you are using standard braided connecting hoses with an internal rubber seal (which is the vast majority of hoses on the market). These hoses seal using a rubber insert in the nut – Teflon tape would be extra and could prevent the seal from seating evenly. Use Teflon tape only on metal threaded connections without their own rubber seal.

Why does my mixer rotate and move after installation?

The cause is an under-tightened compression nut under the basin. Turn off the water, disconnect the hoses, and tighten the nut more firmly with a wrench – but don’t over-tighten, to avoid cracking the ceramic. After tightening, the mixer must stand firmly and must not move during normal use. If it still moves after tightening, check whether the washer is properly seated and whether the compression nut thread is properly engaged.

Can I replace an old two-handle Vittoria mixer with a new single-handle one without further modifications?

In most cases yes – if the basin has a single central hole of 35 mm diameter. If the basin has three holes (typical for old two-handle mixers with separate connections), you need to either cover the side holes with decorative plates or choose a three-hole setup. More on choosing between single and two-handle mixers can be found in the article Single-handle vs. two-handle Vittoria mixer – which one suits your bathroom.

What key do I need to tighten the compression nut under the basin?

Ideal is so-called mixer key (a plumber’s key with a long arm and hook end), which allows work in the confined space under the basin. An alternative is an adjustable key with a long arm or a special hook key. A standard French key usually won’t fit or there won’t be enough space to turn it. A mixer key is a cheap tool (5–15 €) and is useful in every household.

What if the original mixer’s compression nut is plastic and broke during removal?

Plastic compression nuts are commonly available in every plumbing store. Check the thread diameter (usually M10 for mixers with a 33–34 mm neck diameter) and buy a replacement nut. Many Vittoria mixers have compression nuts supplied with the seals – when ordering, it is good to request them.

How long does the entire installation of a basin mixer take?

For an experienced DIYer or plumber: 20–40 minutes including testing. For someone doing it for the first time and without special tools: expect 1–1.5 hours including a possible trip to get missing parts. The longest phase is usually the removal of the old mixer (especially if the compression nut is stuck) and working in the confined space under the basin.

Conclusion – correct installation determines reliability for years to come

Installation of a Vittoria basin mixer is not rocket science, but it does require patience, the right tools and following the procedure. The most important lesson from practice: don’t rush. Every step has its reason – correct sealing, correct tightening torque, correct orientation of the connections. A mixer installed properly once will reliably serve you for 10–15 years without a single problem.

If you are still deciding on a mixer before purchase, take a look at the article How to choose Vittoria mixers – what to focus on before purchase – there you will find the criteria to focus on when choosing. The full range of Vittoria mixers is available at atria.sk/vittoria, where various series are available for different needs and bathroom styles.

Do you have a question on this topic?

Having trouble deciding or dealing with a specific situation in your home? Write to us – we are happy to help.