Worcester Bosch O-Ring Pack of 10 87102050850

This is a Worcester Bosch O-ring supplied in a pack of ten under part number 87102050850. It is a sealing component used at joints and connections within the appliance's water and hydraulic assemblies, where it compresses to form a watertight seal between mating surfaces. The O-ring is listed against a wide spread of Worcester Bosch Greenstar combi and condensing models, including the CC1, HE, HE Plus and ICC2 families.

• A weep or drip at a joint or connection where the O-ring sits, often showing as a slow trickle or damp patch inside the casing
• Visible flattening, hardening or cracking of the ring, so it no longer springs back when compressed
• Scale or corrosion debris embedded in the ring surface, preventing it from seating cleanly
• Water staining, crusting or corrosion on the surrounding metalwork, indicating a long-standing minor leak
• Loss of system pressure that traces back to a seal rather than a component failure

• Check the appliance GC number and serial plate against the compatibility list to confirm this O-ring suits your model.
• Confirm the part number on the existing component or in the appliance literature before ordering, and cross-check the alternative number 1012369 where it appears.
• If the joint is being opened for another repair, check whether any other seals or gaskets on the same assembly also need renewing.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.