Grohe Universal Non-Return Valves - 14117Grohe Universal Non Return Valves 14117 Universal non return valve set designed to help prevent water backflow in compatible GROHE plumbing and shower systems. Features Universal non return valves for compatible GROHE applications Helps prevent backflow for reliable plumbing performance Designed for shower and hand shower systems Durable construction for long lasting reliability Genuine GROHE replacement component Precision engineered for secure fit