2551 Shower Valve Replacement for Posi Temp Valve, 4-Port 1/2 Inch Universal Connection, Built-In 3-Function Transfer Valve Brass Construction for Double Handle Trim Setups

The 2551 Posi-Temp pressure-balancing thermostatic valve cartridge utilizes both heat-sensitive wax and pressure-balancing dual-action technology, instantly responding to changes in water pressure and temperature. It provides the whole family with an extremely safe and consistently stable showering experience, completely eliminating the risk of sudden scalding or chilling during showering.

• Dual-System Thermostatic Safety Protection: The model 2551 pressure-balancing valve integrates a thermostatic wax element and a dynamic pressure-balancing spool. When water pressure fluctuates (e.g., due to toilet flushing), it instantly adjusts the mix of hot and cold water within milliseconds, keeping the outlet temperature within ±1°C (±2°F) of the set point to prevent sudden temperature shocks
• Professional Installation & Broad Compatibility: The Model 2551 thermostatic valve features a professional in-wall cartridge design and must be installed by a licensed plumber. It serves as a direct replacement for many mainstream two-handle pressure-balancing shower valves, making it an ideal upgrade or repair solution
• High-Quality Construction: The valve body of the Model 2551 pressure-balancing valve is built with a precision-machined brass cartridge and durable components, ensuring reliable performance under various water quality conditions. The materials are corrosion-resistant, wear-resistant, and particularly suitable for high-humidity environments such as bathrooms, thereby guaranteeing product longevity
• Cost-Effective Maintenance & Wall Protection: The thermostatic pressure-balancing valve adopts a replaceable cartridge design. For future maintenance, only the internal cartridge needs to be replaced, eliminating the need to break into walls or replace the entire valve system. This can save over 80% of repair costs and hassle
• Temperature Limit Function for Enhanced Safety: The Model 2551 shower valve is equipped with an adjustable temperature limit feature. You can set and lock a maximum safe water temperature (e.g., 38°C / 100°F) to prevent accidental overheating—an essential safeguard for households with children or the elderly