Grundfos Grundfos GNVP DN-50 Non-Return Valve, 83MM O-Ring Dia x 108MM Outer Dia AED1,139.00 (Incl.VAT) Grundfos GNVP non-return valve is designed for installation in pipe systems between two DIN flanges. Thanks to their compact design, the GNVP valves are easy to install. All composite parts have a... Available on Request