Green-Tak Water Pressure Regulating Valve (PRV) is one of other water treatment parts, the PRV is designed to reduce higher pressure from main pipelines to protect the related devices from being damaged by high water pressure. Green-Tak PRV can resist water hammer, and is designed with dual quick-connect fittings, can adjust water pressure at limited water pressure. Features 100% Factory tested. High quality Food Grade Materials. Suitable for RO units and water purifier. Protect any damage caused by high water pressure. Resists water hammer. Quick connection and easy installation. Made in Taiwan.