HIGH QUALITY - Replacement Compatible Perrin & Rowe Mayfair 9.13566 Thermostatic Shower Cartridge Valve. FULLY COMPATIBLE - With your Perrin & Rowe Mayfair Shower. No need to count splines or measure multiple parts - we've done all the work for you. Simply buy with complete confidence, knowing your shower will soon be leak-free! DURABLE MATERIALS – Our thermostatic shower cartridge is built to last. Resistant to corrosion and wear, ensuring long-lasting performance and reliability. GUARANTEED for 12 months. No quibble 30 day returns policy. FAST, EASY FIT - With detailed installation guide included. Faucet Parts USA Perrin & Rowe 9.13566 Compatible Replacement Thermostatic Shower Cartridge Valve