Hamworthy Isolation Valves
The isolation valve is usually situated underneath your appliance and enables the user to control the flow of gas and water in to the central heating system. These also allow you to cut off the supply to the boiler if there is a leak or emergency.
HAMWORTHY 531911040 NON-RETURN VALVE CARTRIDGE
Part No: 2061466 / MPN: 531911040
HAMWORTHY 339011408 1" NON RETURN VALVE
Part No: 2060662 / MPN: 339011408
HAMW 531911012 1.1/2" NON RETURN VALVE - OBSOLETE
Part No: 2061436 / MPN: 531911012