Worcester Bosch O-Ring 2.62mm x 11.91mm 87161408020

The Worcester Bosch 87161408020 is a nitrile O-ring with a 2.62mm cross-section and an 11.91mm inner diameter. It sits within the O-rings and lip seals group of Worcester Bosch spares and forms a compression seal at a joint inside the appliance, holding back water at that connection point. Nitrile is the standard elastomer for this duty, offering resistance to water and the additives found in a domestic heating system.

• Water weeping or a slow drip at the joint the O-ring seals
• Visible hardening, flattening, cracking or a shiny glazed surface on the ring
• Persistent pressure loss traced to a sealed connection rather than pipework
• Scale or mineral deposits sitting in the seal groove
• Damp staining or corrosion around the joint on the appliance casing or nearby components

• Check the appliance GC number or serial plate against the compatibility list to confirm the correct seal for your model.
• Cross-reference the alternative numbers 1017533 and ZMMIS154 before ordering, as these identify the same item.
• Inspect the seal groove and mating face while the joint is open; a scored or corroded face will not seal reliably with a new ring alone.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.