Worcester Bosch Seal Sump Bottom 87161068400

The Worcester Bosch 87161068400 is a sump seal that fits at the bottom of the sump, next to the nut, on Worcester Bosch Greenstar condensing appliances. It forms the watertight joint between the sump and the nut, keeping condensate and system water contained within the assembly. The seal is a service item: heat, condensate and time cause the material to harden and flatten, so it is replaced whenever the sump joint is disturbed or a weep appears.

• Water weeping or dripping from the sump joint, particularly around the nut
• Damp staining, rust or limescale trails on the sump body below the joint
• Boiler losing pressure with no visible leak elsewhere on the system
• Seal visibly flattened, hardened, cracked or perished when the joint is opened
• Condensate smell or residue collecting around the sump area

• Check the GC number and serial plate on the appliance to confirm the exact model before ordering
• Cross-reference the alternative number 1015097 if the original marking on the old seal is unreadable
• Inspect the sump nut and seating face while the joint is open, as a scored or corroded face will not seal with a new gasket alone
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.