O-rings are used in many different sections within your heating system. They are used when joining pipework to different parts within your central heating system.
Heat exchangers, flues, and many other parts require o-rings, washers, and gaskets to prevent leaks of gas or water from occurring.
These O-rings in particular are used to create a seal within the pump.
They measure 4mm in diameter.
See suitability below.
This part number: 3007156 was replaced by part number: 3007177
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