V4043H1056/TW Honeywell V4043H 2 Port 22mm Motorised Zone Valve Twin Pack Perfect for use in domestic and light commercial central heating systems. The Valve is ‘normally closed’, which means that the valve itself will be in a closed state by default whilst the actuator is off. The V4043H is a motorised valve which has end switches that enable you to control either the pump or boiler
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