Ariston Actuator Bush Part No: 998974

• These are used to control the flow of heated water from the boiler, which would typically flow to the hot water cylinder, radiators or both.
• The Actuator valve can be used for control of both heating and hot water, and it works by controlling the flow of water from the heating boiler to other parts of the system.
• This allows the heating to be controlled by a thermostat as the bush sends signals to the boiler.

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