Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Potterton O-Ring 401656

Potterton

Potterton O-Ring 401656

Potterton 401656 O-ring, 15.5mm bore with a 2.65mm section, used on the manifold of Potterton gas boilers.

At a glance

  • Also known as 1122359
Manufacturer part no.
401656
GC number
114-963
Showing prices

£4.56

£3.80 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 Potterton 401656 is a rubber O-ring measuring 15.5mm bore with a 2.65mm cross-section. It is used on the manifold assembly of Potterton gas boilers, where it seals the joint against water or gas leakage. The ring is a service item and is replaced whenever the manifold joint is disturbed or the seal has degraded.

Signs this part needs replacing

  • Water weeping or dripping from the manifold joint
  • The O-ring is visibly perished, cracked or split
  • The ring has flattened or hardened and no longer sits proud of its groove
  • Scale or corrosion deposits on the ring or in the groove
  • The joint has been disturbed during servicing and the old seal cannot be reused

Before you order

  • Confirm your boiler model against the fitment list above
  • Check the existing O-ring dimensions match 15.5mm bore x 2.65mm section
  • Inspect the manifold groove and mating face for corrosion or damage before refitting
  • Check whether any other seals on the same joint also need replacing

Not sure which part?

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