- 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 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
- 20039828 RIELLO 40 G3B A FIREBIRD
- 3743753 RIELLO 40 G3B WARMFLOW
- 3744454 RIELLO 40 G5 WARMFLOW
- 3744515 RIELLO 40 G5 Q
- 3744856 RIELLO 40 G5T Q
- 3749251 RIELLO 40 G5BF 19-25