Crosswater CA43-102 Thermostatic Cartridge

Summary

Crosswater CA43-102 Thermostatic Cartridge

The Crosswater CA43-102 is a genuine thermostatic cartridge for Crosswater shower and mixer valves. It regulates water temperature by balancing hot and cold flow in valves coded WLBP+ or later, ensuring safe and stable showering conditions when fitted correctly.

Dimensions:
Total length (with wax thermostat): 113mm
Total length (without wax thermostat): 120.6mm
Number of 0-rings: 3
Spindle length: 28.9mm
Splines count: 20
Spline diameter: 7.6
Splines height: 6.09
Diameter (widest point): 34.4mm
Diameter (below 1st o-ring): 32.1mm
Diameter (below 2nd o-ring): 30.4mm
Diameter (below 3rd o-ring): 29.2mm
Material: Plastic
Colour: White
Fitting type: Push-fit
Gauzes: 2

Function

This cartridge replaces the original thermostatic element inside the valve body. It ensures thermostatic control and temperature regulation, maintaining safe outlet temperatures even under supply pressure fluctuations.

Confirmed Compatible Crosswater Valve Models and Ranges

• WLBP 1000 series thermostatic shower valves (post-2013) coded WLBP+
• WLBP 1500/1, WLBP 2000/1, WLBP 2500, WLBP 3000/1, WLBP25x31 and WLBP25x3 concealed thermostatic shower valves
• Crosswater Adora 1500 concealed thermostatic shower valve bodies
• Crosswater Belgravia, Celeste, Central, Design, Elite, Essence, Invito, Kai, Modest, MPRO, Svelte, Totti II, Union, Waldorf, Water Square, Wisp, Zero-series thermostatic shower valves and kits specified with CA43-series cartridges

Other Crosswater thermostatic valves coded WLBP+ or later and listed under ranges above may also use CA43-102 — fitment should always be confirmed against the valve’s spare-parts diagram or original code labelling.

Selection and Verification

Before ordering, verify that your shower or mixer valve is coded WLBP+ (2013 onward) or that its spare-parts documentation lists CA43-102 (or older reference CA43-29 / CA43-59) for the thermostat cartridge. Crosswater uses different cartridge types in older or alternative valve families; correct match is essential for safe operation.

When Replacement Is Recommended

Replace the cartridge if the mixer valve fails to hold temperature fails to stabilise outlet temperature under pressure fluctuations delivers too hot or too cold water or leaks internally between hot and cold flow paths. Installing a genuine CA43-102 can restore reliable thermostatic temperature control without replacing the full valve body.