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Baxi Top Seal 7740217

Baxi

Baxi Top Seal 7740217

Baxi 7740217 top seal for Baxi 818 System appliances, forming a watertight joint at the top of the assembly it serves.

At a glance

  • Part type: Seal
  • Also known as 1795804
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
7740217
Showing prices

£9.24

£7.70 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 Baxi 7740217 is a top seal supplied by Baxi for use on Baxi 818 System appliances. It sits at the top of the assembly it serves and forms a watertight joint, preventing water from escaping past the mating faces under normal operating pressure and temperature.

Seals of this type are subject to heat cycling and compression over the life of the appliance, so they are a routine replacement item whenever the joint is disturbed or a weep develops.

Signs this part needs replacing

  • Water weeping or dripping from the joint at the top of the assembly
  • Scale, mineral staining or corrosion around the seal face
  • System pressure falling repeatedly with no other visible source of loss
  • Seal visibly hardened, flattened, cracked or deformed when the joint is opened
  • A leak that returns shortly after the joint has been reassembled with the old seal

Before you order

  • Check the GC number and serial number on the appliance data badge against the compatibility list before ordering, as fitment varies between build batches.
  • The alternative number 1795804 may appear on older documentation and parts listings for this seal.
  • 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.