Worcester Bosch O-Ring 87102050560

This is a Worcester Bosch O-ring supplied as a spare for the manufacturer's Greenstar range of gas combi and condensing appliances. It is a circular sealing component that sits in a machined groove or joint face, compressing under load to stop water escaping from the connection it seals. O-rings of this type are used at internal water-carrying joints, where a hardened or flattened seal will weep, drip or draw air into the system.

• A visible drip or weep at a joint or union on the appliance, with water tracking down the casing or pooling underneath.
• The O-ring has hardened, flattened or cracked with heat cycling, so it no longer springs back when the joint is opened.
• Scale or corrosion deposits on the seal face, which prevent it seating cleanly and allow a slow leak.
• System pressure dropping repeatedly with no obvious external leak, pointing to a seal that is passing internally.
• Staining, crusting or white mineral traces around the joint where the seal sits.

• Check the appliance GC number and serial plate against the compatibility list to confirm this O-ring is the correct item for your model.
• The alternative part number 1012353 can be used to cross-reference the same component on older paperwork.
• Inspect the joint face and any adjacent gasket or washer while the appliance is open, as these are often disturbed during the same repair.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.