Grohe Universal Non-Return Valve - 45481Grohe Universal Non Return Valve 45481 Non return valve designed to prevent backflow and ensure safe water flow in GROHE faucet and shower systems. Features Universal non return valve for GROHE systems Prevents backflow into the water supply Ensures one way water flow for safety and hygiene Ideal for shower systems and hand shower connections Helps maintain system integrity and performance Precision engineered for proper fit and function Durable