Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Sime Air Diaphragm 6028623

Sime

Sime Air Diaphragm 6028623

Sime air diaphragm, 86 mm diameter, part number 6028623, for use in compatible Sime gas boilers.

At a glance

  • Also known as 2042266
Manufacturer part no.
6028623
Showing prices

£5.50

£4.58 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 Sime 6028623 is an air diaphragm with an 86 mm diameter. It is also described as an outer flue rubber ring seal for the top of the sealed chamber, Ø 86. It is used in compatible Sime gas boilers.

Signs this part needs replacing

  • Visible cracking, splitting or perishing of the rubber ring
  • Hardening or loss of elasticity in the diaphragm or seal
  • Flue gas odours or signs of leakage around the outer flue or sealed chamber joint
  • Boiler failing combustion or flue integrity checks

Before you order

  • Check the boiler model and GC number against the fit list above.
  • Confirm the existing part is marked 6028623 or measures 86 mm in diameter.
  • Inspect the flue and sealed chamber area for correct seating and condition before fitting.

Not sure which part?

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