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Shower Valve Spares

We stock shower valve spares for mixer, concealed and bar valves: thermostatic cartridges, diverter cartridges, flow valves, escutcheons, handles and finish kits. Brands include Aqualisa, Grohe, Bristan and Armitage Shanks, with discontinued shower valve replacement parts for older models not stocked by standard retailers.

Shower Valve Spares

Replacement Parts for Every Type of Shower Valve

Identifying the failed component inside a mixer, concealed or bar shower valve.

A shower mixer valve replacement starts with identifying which component has failed. The thermostatic cartridge is the most common culprit: when it wears, the valve can no longer hold a stable temperature. On concealed shower valves the cartridge sits behind the wall plate, making it harder to identify. Diverter cartridges control which outlet receives water, and when they fail, flow splits between overhead and handset. Flow valves and shut-off cartridges handle the on/off and shower control valve function. If you need mixer shower parts or thermostatic shower spares for an exposed shower bar valve, the cartridge depends on brand and model. We carry replacement shower valve components from Abacus, Vado, Crosswater and Burlington, with date-specific Abacus cartridges for concealed valves made before and after January 2015 and discontinued cartridges for Grohe, Matki and Hudson Reed.

What Type of Shower Valve Do You Have?

The valve configuration determines which replacement parts fit.

Concealed Valve

The valve body is behind the wall. Only a round or square control plate and one or two handles are visible. Thermostatic cartridges, diverter cartridges and escutcheon plates are the most common concealed shower valve replacement parts. Check the brand name on the plate before ordering.

Exposed Bar Valve

A visible bar-shaped unit mounted on the wall, with a temperature control at one end and a flow control at the other. Shower mixer parts such as cartridges, handles, levers and service parts are the usual replacements. Bar valve cartridges vary by brand and model.

Bath Shower Mixer Valve

A deck or wall-mounted mixer with a diverter knob or button that switches water between the bath spout and the shower handset. The diverter cartridge is the part that fails most often. Flow cartridges come in clockwise and anti-clockwise close variants, so check the rotation direction before ordering.

Which Shower Valve Spare Do You Need?

Match the fault you can see or feel to the part that fixes it.

What Is Happening	The Part You Likely Need
Water runs too hot or cold and the temperature swings without warning	Thermostatic cartridge. This is the wax or liquid-filled element that blends hot and cold supplies. It sits inside the valve body and is usually brand and model specific. Aqualisa cartridges are colour-coded by water system type (green for high pressure, pink for combi).
Water comes from both the overhead shower and the handset at the same time	Diverter cartridge. Controls which outlet receives water. Available as 2 way or 3 way, depending on how many outlets your valve feeds. Some older models use a ceramic disc diverter rather than a standard cartridge.
The shower turns on but the flow is weak, or the valve will not shut off fully	Flow valve or shut-off cartridge. Handles the on/off and flow rate. These come in clockwise close and anti-clockwise close, so note which direction your handle turns to shut off before ordering a replacement.
The handle turns freely or feels loose without controlling the water	Handle carrier or temperature stop ring. The carrier is a splined adaptor connecting the cartridge stem to the handle. Stop rings limit rotation to prevent scalding. Check tooth count and spline size when ordering.
The chrome plate around the valve is cracked, loose or missing	Escutcheon or cover plate. The decorative plate that conceals the valve body and wall opening. Also called a shroud, back plate or wall plate depending on brand. Measure the fixing centres and check whether it is round or square.
The handle or lever is cracked, discoloured or the indice has fallen off	Handle, lever or indice cap. Handles are function-specific: temperature, flow and diverter handles are not interchangeable. Indices are the small hot/cold or on/off indicator buttons pressed into the handle face.
You are replacing a concealed valve and need the in-wall body before tiling	Rough parts. The valve body and pipework connections installed during first fix. We stock rough parts from Dornbracht, Villeroy and Boch and Aqata for concealed and semi-recessed installations.
You need seals, adaptors, fixing kits or non-return valves for a valve service	Service parts. Small consumables for maintaining an existing valve: O-rings, seals kits, flow limiters, non-return check valves, grub screws and adaptors. Mostly Bristan and Armitage Shanks.

Common Questions About Shower Valve Spares

Answers to the identification, compatibility and cost questions we hear most often.

How do I find the right thermostatic cartridge for my shower valve?

Start with the brand name printed on the valve body, trim plate or handle. A model number narrows it further. Cartridges are rarely interchangeable between brands, and some manufacturers use different cartridges for the same valve depending on when it was made. Abacus concealed valves, for example, take a different cartridge before and after January 2015. If you are not sure which shower cartridge replacement you need, browse our full range of shower valve thermostatic cartridges or email us a photo and we will identify it.

What is the difference between a thermostatic cartridge and a diverter cartridge?

A thermostatic cartridge controls water temperature. It blends hot and cold supplies to maintain a set temperature and is the part to replace if your shower runs too hot or too cold. A diverter cartridge controls where the water goes: overhead shower, handset, bath spout or body jets. If water comes from the wrong outlet, or from two outlets at once, the diverter is the problem. On a 3 way shower valve, both cartridges sit inside the same valve body. See our shower valve diverter cartridges and extensions for replacements.

Can I get replacement parts for a concealed shower valve?

Yes. Concealed valve spares are one of the deeper areas of our range. We stock thermostatic and diverter cartridges, escutcheon plates, handles, finish kits and rough parts for concealed installations from Abacus, Dornbracht, Vado, Crosswater and others. The brand is usually printed on the trim plate or handle. If your shower was supplied by a bathroom retailer such as Victoria Plumbing, the replacement cartridge is often listed under the manufacturer's name rather than the retailer's. Check our Victoria Plumb cartridges for models including the Cruze.

How much does it cost to replace a shower valve cartridge?

The total shower valve replacement cost depends on the cartridge type and whether you fit it yourself. The cartridge alone typically runs between £15 and £210 depending on brand. A Bristan flow cartridge or Aqualisa shroud seal can be under £10, whilst a replacement Aqualisa Opto thermostatic cartridge or Dornbracht rough part sits at the higher end. If you are fitting it yourself, the cartridge is the only expense. A plumber will typically charge an hour's labour on top, though concealed valve access can take longer if tiles need removing.

What are the main parts of a shower valve?

A standard thermostatic shower valve contains a thermostatic cartridge (temperature control), a flow valve or shut-off cartridge (on/off control), and on multi-outlet valves, a diverter cartridge (outlet selection). Around these sit the handles or levers, indices (the hot/cold indicator buttons), a temperature stop ring to limit maximum heat, and the escutcheon or cover plate that finishes the wall opening. Concealed valves also have a rough part body installed behind the wall during first fix, with a separate finish kit fitted after tiling.

Can't find the right shower valve spare?

Send us a photo of your shower valve and the existing part. We will identify the correct replacement before you order.

Email Us For Help

Or email us directly at sales@bathroomspareparts.co.uk

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