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Viessmann O-Ring 17 x 4 7828766

Viessmann

Viessmann O-Ring 17 x 4 7828766

Viessmann 7828766 O-ring, sized 17 x 4, supplied in a pack of five for Vitodens gas boilers.

At a glance

  • Also known as 2321026
Manufacturer part no.
7828766
Showing prices

£16.43

£13.69 ex. VAT · VAT at 20%

Available to order · 1 working day
Available to order · 1 working day
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 Viessmann 7828766 is an O-ring sized 17 x 4, supplied in a pack of five. It is a sealing component used on Vitodens gas boiler assemblies, sitting between mating faces to prevent water or gas weeping at the joint. It is listed in the O-rings, washers and gaskets category of Viessmann gas boiler spares.

Signs this part needs replacing

  • Visible water or gas weeping from the joint the O-ring seals
  • The O-ring has hardened, flattened or taken a permanent set
  • Cracking, splitting or surface crazing on the ring
  • Scale or corrosion debris embedded in the sealing face
  • Water staining or residue around the mating surfaces

Before you order

  • Confirm the O-ring size marked on the existing component matches 17 x 4
  • Check the boiler model and serial number against the fit list
  • Establish how many seals the job needs, as the pack contains five
  • Clean and inspect the mating faces before fitting to avoid damaging the new seal

Not sure which part?

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