The Caleffi F0001223 22mm Circlip Multibloc Valve is a one-piece inlet control solution for unvented hot water cylinders. Combining a 3 Bar Pressure Reducing Valve, 6 Bar Pressure Relief Valve, check valve, and filter, it ensures optimal safety and system efficiency. With 22mm copper connections and robust construction, it’s ideal for domestic and light commercial hot water systems.