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Worcester Bosch Fibre Washer Pack CDi 77161922050

Worcester Bosch

Worcester Bosch Fibre Washer Pack CDi 77161922050

Worcester Bosch CDi fibre washer pack, part 77161922050, for sealing water and combustion joints on CDi 24, 26, 28 and 35 boilers.

At a glance

  • Part type: Gaskets, o-rings, seals and washers
  • Also known as 1011535, N6498
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
77161922050
GC number
299-355
Showing prices

£21.06

£17.55 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Worcester Bosch CDi fibre washer pack contains fibre sealing washers used on CDi-series gas boilers. Fibre washers sit between mating faces at joints in the water circuit and around combustion-path connections, compressing to form a tight seal when the joint is tightened. They prevent water loss from the heating and hot water circuit and help keep combustion gases contained within the appliance. This pack is supplied under Worcester Bosch part number 77161922050.

Signs this part needs replacing

  • Water weeping, dripping or staining around a joint on the boiler casing or pipework
  • A washer that has hardened, flattened or cracked when the joint is opened for other work
  • Repeated pressure loss on the heating circuit with no obvious leak elsewhere
  • Soot marks, staining or a slight smell at a combustion-path joint
  • A joint that will not seal cleanly after being disturbed and reassembled

Before you order

  • Check the boiler model and GC number against the compatibility list before ordering, as the same washer is used across several CDi variants.
  • The previous number for this item is SPK0128; alternative numbers 1011535 and N6498 refer to the same washer.
  • If several seals are being renewed during the same visit, check whether a full gasket and seal kit is needed for the job.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.