A thermocouple is a device that is made of two different metals that produce a small charge when heated on one side. This small electrical charge switches on an electromagnet which opens a valve and no longer restricts the flow of water or gas .
Fits a Number of Appliances
Technical specification
Waist Sizead47cd13fxToilet Cistern CapacityFTW--Supplier Part Number725171Brand NameThermocouple