Grohe Universal Non-Return Valves - 14116Grohe Universal Non Return Valves 14116 Non return (check) valves designed to prevent backflow and protect water systems in GROHE installations. Features Prevents backflow of water into the supply system Designed for GROHE shower and thermostatic systems 1 2 connection size for standard plumbing setups Supplied as a pair Ensures hygienic and safe water operation Precision engineered for reliable performance Durable construction for long term use