Grohe Universal Non-Return Valve - 08565Grohe Universal Non Return Valve 08565 Universal non return valve designed to help prevent water backflow in compatible GROHE plumbing and shower applications. Features Universal non return valve for compatible GROHE systems Helps prevent water backflow for reliable plumbing performance Designed for use in shower and hand shower applications Durable construction for long lasting reliability Genuine GROHE replacement component Precision engineered for