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Navien O-Ring EPDM 20017211A

Navien

Navien O-Ring EPDM 20017211A

EPDM O-ring, 18.8 x 2.4 mm, P19 profile, for Navien NCB-CE ERP boilers. Part 20017211A.

Manufacturer part no.
20017211A
Showing prices

£4.08

£3.40 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 O-Ring (part 20017211A) is an EPDM rubber sealing ring used across the Navien NCB-CE ERP boiler range. It seals a joint in the appliance's water circuit, preventing weeping and pressure loss at the connection. The ring is produced to the P19 designation in an 18.8 x 2.4 mm size, with a 70 hardness rating and a black finish.

Signs this part needs replacing

  • Water weeping or dripping from the joint the O-ring seals
  • Visible flattening, hardening or cracking of the rubber
  • Scale, corrosion or debris deposits on the sealing face
  • Unexplained loss of system pressure that cannot be traced to another component
  • Swelling or discolouration of the ring after contact with system water

Before you order

  • Confirm your appliance model and serial number against the fit list above
  • Check the existing O-ring matches the 18.8 x 2.4 mm size and P19 designation
  • Confirm EPDM is suitable for the system water and any inhibitor or dosing in use
  • Check how many O-rings the joint requires before ordering

Not sure which part?

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