Plasson DZR double check valves are use to prevent back-flow, back siphoning and cross contamination of the wholesome (potable) water supplies with internal consumer circuits (non-potable). These units are WRC approved and are manufactured for the latest 'green list' of materials to comply with the impending material requirements of the EU to improve water quality.

The high quality materials and modern sealing systems yields a long service life. There are also suitable for underground use and have female BSP threaded connection either end.