RA-N valve housings are used in two-pipe systems (pump hot water systems) to ensure optimum adjustment. They are nickel-plated and come with a red construction protection cap. RA-UN valve housings are used in pump hot water systems with high spreads such as district heating or systems with condensing boilers. They are nickel-plated and come with a yellow construction protection cap. RA-UR valve housings are intended for installation in the return or in the case of swapped feed and return. They are nickel-plated and come with a yellow construction protection cap. No tools are required to preset the valves. A safety ring is available for protection against unauthorized adjusting. Main Features Functions Easy Installation Yes Scope of Delivery Quantity per pack 1 piece(s)