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Johnson & Starley Cap Assembly Q440-0124000

Johnson & Starley

Johnson & Starley Cap Assembly Q440-0124000

Heat exchanger cap assembly for the Johnson & Starley Hispec M31 boiler, manufacturer part number Q440-0124000.

At a glance

  • Part type: cap assembly
  • Also known as 1693192
Manufacturer part no.
Q440-0124000
Showing prices

£23.22

£19.35 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

Cap assembly for the heat exchanger, manufactured by Johnson & Starley. It is listed for the Johnson & Starley Hispec M31 boiler. The cap forms part of the heat exchanger assembly, closing off and sealing the relevant connection point on the appliance.

Signs this part needs replacing

  • Visible corrosion, cracking or distortion on the cap
  • Water or residue tracking around the heat exchanger cap
  • Loss of system pressure with no other obvious cause
  • Overheating or lockout traced to the heat exchanger area
  • Sealing face degraded or gasket material perished

Before you order

  • Confirm the appliance model is the Johnson & Starley Hispec M31
  • Check the existing cap against the manufacturer part number Q440-0124000
  • Inspect the heat exchanger connection for damage before fitting
  • Work on the heat exchanger should be carried out by a competent heating engineer

Not sure which part?

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