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Worcester Bosch O-Ring 87402050030

Worcester Bosch

Worcester Bosch O-Ring 87402050030

Worcester Bosch O-Ring, part 87402050030, for Greenstar combi and condensing models; seals internal joints to keep the appliance leak-free.

At a glance

  • Part type: O-rings and lip seals
  • Also known as 1020277
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87402050030
GC number
E27-553
Showing prices

£2.36

£1.97 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 87402050030 is an O-ring used inside Worcester Bosch gas appliances, listed under the O-rings and lip seals spare part group. It sits at an internal joint and forms a compression seal, keeping water or gas paths contained so the appliance continues to run as designed. It is a service item that belongs to the Greenstar family of combi and condensing boilers.

Signs this part needs replacing

  • Weeping or visible water traces around the joint the seal sits in
  • The ring has hardened, flattened or cracked with heat ageing
  • Scale or corrosion deposits built up on the sealing face
  • A joint that will not seal after being stripped and rebuilt
  • Gradual pressure loss traced to a seal rather than the component itself

Before you order

  • Check the GC number and appliance serial plate against the compatibility list to confirm the correct seal for your model.
  • Note the previous number DD97904407 and the alternative number 1020277 when cross-referencing older documentation.
  • If the joint is being opened for another repair, check whether a full gasket or seal kit is the better route.
  • 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.