Sime O-ring Dalmar Gasket and washers are used in various sections within your central heating boiler. They are used to create seals between pipework and other parts within the boiler. Heat exchangers, condensate traps, and many other parts require O-rings, washers, and gaskets to prevent leaks of gas or water from occurring.
Fits a number of Sime boilers
Technical specification
TypeO-ringMaterialRubberManufacturer Model No6226421Brand NameSime