Worcester Bosch O-Ring 2.62mm x 17.86mm 87161408060

This is a Worcester Bosch O-ring with a cord thickness of 2.62mm and an outside diameter of 17.86mm, supplied under part number 87161408060. It is a flexible sealing ring that sits in a machined groove or against a mating face inside the appliance, where it compresses to close the gap between two components and stop water or gas from escaping. O-rings of this size are used across the Worcester Bosch boiler range on joints, unions and internal assemblies, and this one is listed against a large number of Worcester models.

• A weep or drip at the joint the O-ring seals, often showing as water staining or corrosion nearby
• Visible flattening, hardening or cracking of the ring once the joint is opened
• A ring that has swollen or stretched and no longer sits correctly in its groove
• Scale or debris trapped under the seal, preventing it from seating
• Repeated loss of system pressure traced back to a joint rather than the boiler itself

• Check the GC number and model plate on the appliance against the compatibility list to confirm this O-ring is the correct item for your boiler
• Cross-reference the alternative numbers 1017539 and N2257 if you are working from an older parts list
• Inspect the surrounding joint and any adjacent seals while the appliance is open, as a seal kit may be the more practical option if several rings are perished
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.