Fastwarm 22mm 2 port motorised valves are used to zone your homes heating. Allowing independent control of your underfloor heating system and homes central heating. Fastwarm 22mm Motorised valve, two port zone normally closed, 230 V AC operation with microswitch. Head assembly fixed. Industry standard synchronous motor. Is used for a 'S' plan valve to control your heating system independently using a 3 amp switch.