The Worcester Bosch 87161165490 O-Ring Pack includes ten genuine replacement sealing rings sized 13.87 mm outer diameter × 3.53 mm thickness, designed for use in internal hydraulic and gas connections within CDi and Greenstar series boilers. These O-rings create resilient, leak-free seals at joints and fittings where pipes, valves or sensors meet, helping prevent water or gas leakage, maintain system pressure and protect sensitive components from moisture ingress. Over time, O-rings can harden, crack or deform, which may lead to leaks, pressure loss or error codes; replacing them with the correct OEM set helps restore reliable sealing integrity.

This pack of ten O-rings is compatible with Worcester Bosch CDi and Greenstar boilers that reference part number 87161165490 in their parts documentation. To ensure correct fitment and effective sealing performance, always confirm that the part number and dimensions match the requirements for the specific joint or component being serviced, as sealing rings vary in size and application throughout the appliance.

Supplied as a ready-to-use pack of ten genuine Worcester Bosch O-rings, this set allows a qualified engineer to replace worn or degraded seals during maintenance or component replacement. Choosing these genuine components helps maintain stable pressures, supports leak-free connections and contributes to dependable central heating and hot-water performance in compatible CDi and Greenstar boilers.