Replacement of the battery seal and cartridge Opera

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Replacing the seal and cartridge of an Opera tap: a complete guide for everyone

A leaking tap is one of the most common problems in every household. Surprisingly, most people call a plumber as soon as they see the first drops – while replacing the seal or cartridge of an Opera tap is a task that every handy DIYer can accomplish in an hour, using common tools and spare parts for just a few euros. This article will walk you through the entire process from diagnosis to final testing – with a focus on real-life situations, correct dimensions and procedures that actually work.

If you haven't read the article Common faults of Opera taps: dripping, low pressure, squeaking, we recommend starting there – it will help you accurately identify what is wrong with your tap and whether it is really a problem with the seal or cartridge, or something else (e.g. a clogged aerator or a problem with water pressure in the supply).

Why an Opera tap starts to drip: causes of wear

Before you start disassembling, it is good to understand why wear occurs in the first place. Opera taps – like all other quality taps – use either rubber seals (in older two-handle models) or a ceramic cartridge (in modern single-lever models) to regulate water flow. Both systems have their own characteristics and different ways of wearing out.

Rubber seals are prone to degradation due to chlorinated water, thermal stress and mechanical wear from each opening and closing of the tap. In hard water (hardness above 20 °dH, which is the case for most Slovak cities), limescale deposits also form, which mechanically damage the seal – the seal no longer closes evenly and water starts to leak. Typically, the seal starts to behave problematically after 3 to 7 years of intensive use, and in soft water it can last up to 10 years.

Ceramic cartridges are more durable – ceramic is an extremely hard material that does not wear out as easily. Despite this, a cartridge can fail, especially when limescale deposits settle inside the mechanism and disrupt the movement of the ceramic discs. Another cause is mechanical damage during handling (e.g. when forcefully turning the lever) or micro-cracks in the ceramic. The lifespan of a quality ceramic cartridge is 10 to 20 years under normal use.

Diagnosis: where exactly is it dripping and what does it mean

Before you run to the store to buy spare parts, spend 5 minutes on proper diagnosis. The place from which the water is dripping reveals a lot:

Drips from the outlet (spout): A classic sign of seal or cartridge wear. Water leaks through the closing mechanism, even when the tap is in the "closed" position. Priority: replace the cartridge or the valve seal.
Leaking around the lever or tap body: A problem with the O-ring or seal in the rotating mechanism area. Usually a simple and cheap repair – it is enough to replace one small rubber O-ring.
Leaking at the base of the tap (where it is connected to the sink or wall): Here the problem is not with the cartridge or seal inside the tap – it is with the connection to the water supply. Check the connecting hose and tightening of the nut, or the O-ring at the base.
Leaking at the shower hose or at the shower head: A problem with the seal of the hose connection, not with the tap cartridge itself.

This article primarily focuses on the first two scenarios – that is, replacing the cartridge and the seal inside the tap body.

What you will need: tools and materials

Good preparation is half the success. Gather everything before you turn off the water – you don't want to spend half an hour searching for a wrench with the water turned off in your entire apartment.

Tools:

Adjustable wrench (French key) or socket wrench 22–27 mm
Flat screwdriver (no. 5 or 6)
Crosshead screwdriver (Philips PH2)
Hex keys (Allen) – set 2.5 to 5 mm (very often needed 3 mm or 4 mm for the screw under the lever cap)
Rubber pad on the jaws of the wrench (or a cloth) – to avoid scratching the chrome surface
Soft cloth or an old toothbrush for cleaning the threads
Sponge and bucket to catch residual water
Flashlight or headlamp

Materials and spare parts:

Replacement cartridge – of the correct diameter (most commonly 35 mm or 40 mm for single-lever Opera taps)
Or a set of seals (rubber valve seal + O-rings) for two-handle taps
Teflon tape (PTFE) – in case of sealing the threads
Silicone lubricating grease (suitable for potable water – without solvents)
Paper towels

Important note on the cartridge size: always remove the old cartridge before purchase and bring it with you as a sample, or measure its diameter with a caliper. Standard diameters are 25 mm, 35 mm and 40 mm, but there are also other sizes. On the page atria.sk/opera/ you will find an overview of Opera taps and most products have the type and diameter of the cartridge listed in the parameters. If you are unsure, you will also find help in the article Dimensions and connection of Opera taps: what to check before purchase.

Step-by-step procedure for replacing the cartridge in a single-lever Opera tap

Single-lever taps are now the standard. They are operated by one lever, which controls both temperature (left-right axis) and flow (up-down axis). The entire mechanism is based on a ceramic cartridge, which is inserted directly into the tap body.

Step 1: Closing the water supply

This is the most important step that is most often forgotten during an improvised repair. Close the angle valves under the sink or bathtub – these are small ball valves directly on the supply pipe, usually marked with a red dot (hot) and a blue dot (cold) or handle. Turn them 90° – the handle must be perpendicular to the pipe. If there are no angle valves, or they do not work (which can happen in older apartments), you must close the water at the apartment shut-off valve or on the riser.

After closing the water, open the faucet to drain the remaining water from the pipe. Great, now you can work without the risk of flooding.

Step 2: Removing the handle

At the top of the handle is usually a plastic cap – blue, red, or chrome, depending on the model. This cap covers the screw that holds the handle. Gently pry off the cap with a flat screwdriver (be careful, some are clipped, others glued). Under the cap you will find a screw – most often an Inbus 3 mm or 4 mm (less often Philips). Unscrew it and pull the handle upward – it should release without much force. If it resists, check that you have indeed unscrewed all the screws, and gently tap the side with a rubber mallet.

Step 3: Unfastening the cartridge retaining nut

Under the handle you will see a plastic or metal ring – the cartridge retaining nut. This nut holds the cartridge in the body of the faucet. Unscrew it by hand or with an adjustable wrench (wrap the jaws of the wrench in a cloth to avoid scratching the chrome surface). The nut unscrews counterclockwise.

Step 4: Removing the old cartridge

After unscrewing the nut, the cartridge should come out easily – grasp it by the upper protruding tab and pull it straight up. Sometimes it is held in place by limescale – in such a case, gently turn it left and right while pulling up. Do not force it, do not use pliers on the body of the cartridge – you might break it and complicate the situation.

Once the cartridge is removed, inspect the cavity in the body of the faucet – if there are larger deposits of limescale, remove them with a soft brush and vinegar (let it sit for 15–20 minutes, then rinse with clean water). A clean cavity ensures proper seating of the new cartridge.

Step 5: Installing the new cartridge

Gently apply silicone grease to the seals (O-rings around the cartridge) of the new cartridge. Do not force it – it must be properly oriented. Most cartridges have protrusions or grooves that exactly match the cavity in the body of the faucet – the cartridge can be inserted in only one way. Gently push it down until it stops. Check that the cartridge is level – it must not be tilted.

Reattach the retaining nut – first by hand (2–3 turns), then tighten with a wrench. Do not over-tighten – you might damage the thread or the seal. Tight enough means secure, not with all your strength.

Step 6: Reassembly of the handle and testing

Put the handle back on – make sure it properly engages the groove on the cartridge. Tighten the screw and put on the cap. Now carefully open the angle valves – first only half a turn. Check that nothing is dripping anywhere. If everything is in order, open the valves fully and test the faucet in all positions: cold, hot, mixed, maximum flow. Excellent – done.

Procedure for replacing the seal in a two-handle Opera faucet

Two-handle faucets (with a separate handle for hot and cold water) have a simpler shut-off mechanism, but the seal in them wears out faster. If you have an older Opera faucet with two rotating handles, the procedure for replacing the seal is as follows:

Removing the handle of the two-handle faucet

Close the water supply (the same procedure as for a single-lever faucet). Turn the handle to the "open" position – the stem is thus extended upward and easier to work with. Remove the decorative cap at the top of the handle – it either turns or unscrews. Under it is a screw (usually Philips PH2 or PH1) that holds the handle. Unscrew it and pull the handle upward.

Removing the stem and seal

Now you can see the top edge of the valve body with a plastic or metal sleeve. This sleeve is threaded into the body of the faucet. On its sides are surfaces for the wrench (usually 22 mm or 24 mm). Unscrew the stem sleeve counterclockwise – it may be stiff if it is held by limescale. Do not over-tighten, do not use excessive force.

Once the sleeve is removed, the stem will come out with it. At the bottom end of the stem is the seal – a round rubber plate that is fastened by a central screw (M4 or M5). Unscrew the screw, remove the seal and inspect it. If it is deformed, hardened, cracked or visibly worn, replace it. A proper seal for Opera valves usually has a diameter of 10–15 mm and a thickness of 2–4 mm, but always check the dimensions according to your specific faucet.

Installing the new seal and reassembling

Lightly moisten or grease the new seal with silicone grease (never use vegetable or mineral oil – they degrade the rubber). Secure it with the central screw – tighten it firmly, but do not over-tighten (the seal could deform). Also grease the O-rings on the stem sleeve. Reattach the stem sleeve into the body of the faucet, put on the handle, tighten the screw and cover with the cap. Open the water supply and test it.

Sealing Ring Replacement: Fixing Leaks Around the Lever or Handle

If water is not dripping from the spout, but from the area around the lever or from the place where the spindle comes out, the problem is not with the cartridge or the valve seal, but with the O-rings. These small rubber sealing rings seal the rotating axis and are extremely cheap spare parts – a pack of 10 different O-rings can be purchased for a few euros at any hardware store.

The procedure is simple: remove the lever (as described above), and you will see the O-rings directly on the cartridge body or on the spindle. The O-ring is seated in a groove – use the tip of a screwdriver to carefully push it out (be careful not to damage the groove) and fit a new one of the same size. Before fitting, lightly grease it with silicone lubricant.

O-ring dimensions are marked, for example, as 10×2, meaning an inner diameter of 10 mm and a cross-section thickness of 2 mm. Accurate dimensions can be measured with a caliper.

Special Cases: Thermostatic Taps Opera

Certain Opera taps are equipped with a thermostatic cartridge – a special mechanism that automatically maintains the set water temperature. A thermostatic cartridge is a technically more complex part and its replacement is more demanding. In addition to the cartridge itself, it also contains a temperature sensor (wax or bimetal), a pressure spring, and several seals.

If a thermostatic Opera tap stops maintaining the temperature (the water is always either too hot or too cold, regardless of the setting), the cause is usually a worn or clogged thermostatic cartridge. The replacement is similar to that of a standard single-lever cartridge, but you must pay attention to the correct orientation and calibration after installation. For thermostatic taps, we always recommend consulting the service manual for the specific model, or entrusting the work to a professional.

Where to Find the Right Spare Parts for Opera Taps

This is a question many customers encounter. Opera taps are available through a wide network of plumbing suppliers, and spare parts – especially cartridges and seals – are available either directly from the manufacturer or in the form of compatible replacements. On the website atria.sk/opera/ you will find the current range of Opera taps including accessories.

When looking for a replacement cartridge, follow these steps:

Note the model of the tap – it is usually listed on the warranty card, in the installation instructions, or directly on the body of the tap (engraved number or label).
Measure the diameter of the cartridge – after removing the old cartridge, measure its outer diameter. The most common values are 25 mm, 35 mm, and 40 mm.
Check the height of the cartridge – an equally important parameter. A cartridge that is shorter or longer than the original may not fit properly.
Check the number of turns – some cartridges have a limited rotation range (e.g., 90° or 120°), while others are unlimited. It depends on the type of tap control.

Be cautious of cheap, no-name cartridges from unreliable sources – they may be made of substandard ceramic or rubber unsuitable for potable water. For Opera taps, we recommend original or certified spare parts. The long-term cost of a cheap cartridge that needs to be replaced in a year is higher than the cost of a quality original that lasts 15 years.

Preventive Maintenance: How to Extend the Life of the Cartridge and Seal

The best repair is the one you don’t have to do at all. A few simple measures can significantly extend the life of your entire Opera tap:

Regular aeration filter cleaning: A clogged aeration filter increases pressure on the cartridge. More on this in the article Cleaning and Maintenance of Opera Taps for Longer Lifespan.
Water softener or filter: If you have hard water (over 15 °dH), consider installing a water softener. Limescale is the number one enemy of every seal and cartridge.
Do not force the lever or handle: The ceramic cartridge is durable, but excessive force can crack the ceramic plates. There is no need to twist the tap "all the way" – a normal closed position is sufficient.
Do not push the lever sideways: Single-lever taps are not designed to handle lateral loads. If you lean on the tap, the cartridge mechanism or the body of the tap may be damaged.
Monitor water pressure: The operating pressure for Opera taps is usually 1–5 bar (some models up to 10 bar). If you have a pressure above 4 bar at home (which is common in apartment buildings), consider installing a pressure regulator before the tap. High pressure shortens the lifespan of seals and cartridges.

For more on how to choose Opera taps with regard to water parameters and pressure, see the article How to Choose Opera Taps for the Bathroom and Kitchen.

When to Call a Plumber Instead

We are advocates of doing as much as possible yourself – it saves time and money. Despite this, there are situations when it is wiser to call a professional:

The tap is embedded in the wall (recessed tap) – such repairs carry a risk of damaging the tiling, and access to the internal mechanism is more complicated.
The body of the tap is cracked or deformed – replacing the seal will not help; the entire tap must be removed.
The threads in the body of the tap are damaged or worn – without the right tools and knowledge, you may make the situation worse.
The cartridge retaining nut is so stuck or encrusted with limescale that you cannot unscrew it – applying too much force may crack the body of the tap.
The thermostatic cartridge requires calibration – incorrect calibration can lead to burns (water too hot), especially if the tap is in a shower.

Frequently asked questions (FAQ)

How can I find out whether I need to replace the cartridge or just the washer?

It depends on the type of your tap. If you have a modern single-lever tap Opera, it contains a ceramic cartridge – it is a single unit and must be replaced entirely. If you have an older two-handle tap, it uses a rubber washer (sealing plate), which is a separate part. If water is dripping around the lever or handle (not from the spout), the problem is with the O-ring – neither the cartridge nor the valve washer needs to be replaced.

Can I use a different (non-original) cartridge in an Opera tap?

Yes, as long as it has the same diameter, height and function. There are certified replacement cartridges from European manufacturers that are fully compatible with Opera taps. However, always buy from verified sellers and check that the cartridge is certified for potable water (marked with WRAS, DIN or equivalent). We recommend bringing the old cartridge as a sample and comparing the dimensions directly in the store.

The new cartridge still drips – what did I do wrong?

The most common causes: 1) The cartridge locking nut is not tightened enough – tighten it a little more (not forcefully). 2) The cartridge is not properly oriented – check whether it fits into all the grooves. 3) The cartridge has the wrong dimensions – check the diameter and height. 4) The cartridge seat in the tap body is damaged or dirty – clean the cavity and check whether the seating surface is scratched. 5) Rarely, the new cartridge may be defective – return it and request an exchange.

How long does it take to replace an Opera cartridge for a typical DIY enthusiast?

For the first replacement, allow 30–60 minutes including preparation, disassembly and testing. For a subsequent replacement of the same model, you can do it in 15–20 minutes. Complications (limescale deposits, damaged threads) may extend the time. A professional plumber can do it in 15–30 minutes.

Can I replace the cartridge if I don't know where the water shut-off valve is in my apartment building?

No – this is a strict requirement. You cannot disassemble the tap without turning off the water supply. If there are no corner valves under the tap or they are not working, first locate the shut-off valve on the apartment riser (usually in the hallway or in the technical shaft) and only then proceed with the repair. During a complete installation renovation, we recommend installing new corner valves at the same time – they will save you from unnecessary complications in the future.

Is it worth replacing the cartridge, or is it better to buy a new tap?

It depends on the age and condition of the tap. If the Opera tap is less than 10 years old and otherwise in good condition, replacing the cartridge for 5–25 € is clearly more economical than buying a new tap for 50–200 €. If the tap is older, has visible damage to the chrome surface, cracks or repeated problems, it is worth investing in a new one. You can find an overview of current models at atria.sk/opera/. Read more about the comparison of quality and durability of different models in the article Opera taps vs. other brands: a comparison of quality and price.

Conclusion: replacing a cartridge or washer is not rocket science

Replacing a washer or cartridge in an Opera tap is a task that any skilled DIY enthusiast can complete without a plumber, provided the procedure is followed correctly. The key is good preparation – proper diagnosis, replacement parts in the correct size and basic tools. A crucial condition is turning off the water supply before starting the work – this is the only rule that must not be violated.

An investment in a quality replacement cartridge or washer pays off many times over – the Opera tap will function like new for another 10–15 years, without dripping, without wasting water and without unnecessary noise. And if you have decided to renovate your bathroom completely, in the Opera taps category at atria.sk you will find a complete range – from simple basin taps through modern thermostatic shower systems to design series for luxury bathrooms.

Do you have a question about this topic?

Not sure or dealing with a specific situation in your home? Write to us – we are happy to help.