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Worcester Bosch O-Ring 3.53mm x 12.29mm 87102051040

Worcester Bosch

Worcester Bosch O-Ring 3.53mm x 12.29mm 87102051040

Worcester Bosch O-ring 87102051040 with a 3.53 mm x 12.29 mm profile, fitted to Greenstar Heatslave II models.

At a glance

  • Part type: O-ring
  • Also known as 1020794
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87102051040
GC number
H71-421
Showing prices

£4.04

£3.37 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 87102051040 is a replacement O-ring seal for Worcester Bosch heating appliances. It has a 3.53 mm x 12.29 mm profile and sits at a joint inside the unit, where it is compressed to form a watertight seal and keep the appliance running reliably. It is listed within Worcester's O-rings and lip seals spare part range and is supplied as a single ring.

Signs this part needs replacing

  • Weeping or a visible drip at the joint the O-ring seals
  • Water staining or mineral deposits around the seal seat
  • The ring feels hard, flattened or brittle instead of pliable
  • Cracks, nicks or a flattened cross-section found on inspection
  • Repeated pressure loss traced back to the sealed joint

Before you order

  • Check the appliance model and GC number against the compatibility list before ordering.
  • The alternative number 1020794 identifies the same O-ring.
  • 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.