Worcester Bosch Washer 15mm Thick 87161409170

The Worcester Bosch 87161409170 is a 15 mm sealing washer with a thicker section, supplied by Worcester Bosch for use on its heating and oil-fired appliances. It belongs to the gaskets, o-rings, seals and washers group of spares and is fitted at a joint where two mating faces are drawn together. Under compression the washer fills the gap between the faces and forms a watertight barrier, so it is a small but critical part of keeping the appliance dry and running correctly.

• A weep or drip at the joint the washer seals, often visible as a trace of water or staining around the fitting.
• Water tracking down the pipework or component below the joint after the appliance has been running.
• The washer has hardened, flattened or cracked, so it no longer springs back when the joint is tightened.
• Corrosion or scale build-up on the washer face, which prevents it seating squarely against the mating surface.
• A joint that continues to seep after being re-tightened, indicating the washer has taken a permanent set.

• Check the appliance model and GC number against the compatibility list to confirm this washer is the correct item for your joint.
• Note the previous number ZGWSH115 and the alternative numbers 1017621 and WB87161409170, which may appear on older paperwork or parts listings.
• Confirm the size and section of the washer being removed, as 15 mm washers are used in more than one position across the Worcester Bosch range.
• If the joint uses several seals, check whether the other washers and o-rings in the assembly also need renewing at the same time.