Thermostatic Shower Valve Cartridge | Brass Bath Mixer Repair Kit

Restore Perfect Temperature Control to Your Shower or Bath

Keep your shower running smoothly with this premium Thermostatic Shower Valve Cartridge. Crafted from solid brass and engineered to deliver consistent water temperature, this replacement spool core is the ideal fix when your mixer tap starts fluctuating between hot and cold. Designed for straightforward DIY installation — no drilling required — this cartridge slips directly into your existing thermostatic faucet housing and tightens in place for a secure, long-lasting fit.

Made in Mainland China.

Key Features

• Premium Brass Construction: Full brass/copper body paired with durable plastic and alloy components ensures strength, corrosion resistance, and years of reliable use.
• Precise Temperature Range: Operates between 20°C and 48°C (68°F–118°F) with a built-in safety override that defaults to 38°C (100°F), keeping every shower safe and comfortable.
• Easy No-Drill Installation: Simply insert the valve core into the faucet body and tighten — no specialist tools or professional plumber needed.
• Universal Thermostatic Compatibility: Designed for use with built-in and exposed thermostatic bath/shower mixer valves.
• Stable Water Temperature: Ideal replacement when your existing mixer experiences temperature instability or inconsistent hot/cold output.
• Exceptional Value: Manufactured with quality and longevity in mind, giving you a cost-effective alternative to full valve replacement.

Specifications

What's in the Box?

• 1 × Thermostatic Spool / Valve Cartridge

Important Notes

• Actual colour may vary slightly from images due to monitor brightness and lighting conditions.
• Please allow minor measurement tolerances for stated dimensions.
• Please verify cartridge dimensions against your existing valve before purchasing to ensure compatibility.

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For guidance on safe plumbing practices and water heater temperature settings, visit the CDC Healthy Water resource for authoritative information on safe water temperature management in the home.

Frequently Asked Questions

Q: What is a thermostatic shower valve cartridge and when should I replace it?

A: A thermostatic shower valve cartridge (also called a spool or valve core) is the internal component of a thermostatic mixer tap that regulates and maintains a consistent water temperature. You should consider replacing it when your shower or bath mixer begins fluctuating between hot and cold water temperatures, fails to hold a set temperature, or the handle becomes stiff and hard to operate.

Q: Is this thermostatic cartridge easy to install at home?

A: Yes — installation is designed to be straightforward and DIY-friendly. No drilling is required. Simply turn off your water supply, remove the old cartridge from the faucet body, insert this replacement brass spool, and tighten securely. Always refer to your mixer valve manufacturer's guide for model-specific steps.

Q: What temperature does the built-in safety override set this cartridge to?

A: This thermostatic valve cartridge features a safety override that defaults to 38°C (100°F), a comfortable and safe temperature for most household shower and bath use. The full operational range is 20°C to 48°C (68°F to 118°F).

Q: Will this cartridge fit my existing shower mixer valve?

A: This cartridge is designed to be compatible with a wide range of built-in and exposed thermostatic bath/shower mixer valves. However, thermostatic cartridges vary by manufacturer and model. We recommend measuring your current cartridge dimensions carefully and comparing them to this product before purchasing to ensure a proper fit.