Worcester Bosch O-Ring 2.0 x 14mm EPDM 87161408520

The Worcester Bosch 87161408520 is a moulded EPDM O-ring with a 2.0 mm cord section and a 14 mm internal diameter, rated at 70 Shore hardness. It sits in a machined groove and compresses between two mating faces to form a watertight joint inside the appliance. EPDM is used here because it holds its shape and resists hot water, steam and long-term ageing better than nitrile in this position.

• A weep or drip at the joint the ring seals, often showing as a crusty white or green deposit around the fitting.
• The ring has hardened, flattened or taken a set, so it no longer springs back when rolled between finger and thumb.
• Visible cracking, splitting or a nibbled edge on the ring, usually found when the joint is opened for other work.
• Water tracking down the component below the joint, or staining on the casing and pipework nearby.
• Repeated loss of pressure at the same connection after the joint has been tightened.

• Check the appliance GC number and model plate against the compatibility list before ordering, as the same O-ring size is used across several variants.
• Confirm the alternative number 1017595 matches any reference you already hold for this seal.
• Inspect the mating faces and groove for scoring or corrosion while the joint is apart; a damaged groove will not seal with a new ring alone.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.