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Navien O-Ring 20007001A

Navien

Navien O-Ring 20007001A

EPDM O-ring, 69.4 x 3.1 mm, 70 hardness, black, for Navien NCB-CE, NCB300 and NCB500 boilers.

Manufacturer part no.
20007001A
Showing prices

£4.27

£3.56 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 Navien 20007001A is an EPDM O-ring with a listed size of 69.4 x 3.1 mm, a 70 hardness reference and a black finish. It is used as a sealing component on Navien NCB-CE, NCB300 and NCB500 combi and system boilers. The O-ring sits in a machined groove and compresses to form a watertight seal at the joint it serves.

Signs this part needs replacing

  • Water weeping or a visible drip from the joint the O-ring seals
  • The O-ring has flattened and no longer sits proud of its groove
  • Hardening, cracking or perishing of the rubber
  • Black residue or scale build-up on the seal face
  • Recurring loss of pressure at a joint that has already been resealed

Before you order

  • Confirm your boiler model and serial number against the fit list above
  • Compare the listed size and material with the O-ring removed from the appliance
  • Inspect the groove and mating face for corrosion, scoring or scale before fitting a new seal
  • Check whether any other seals on the same joint need replacing at the same time

Not sure which part?

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