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Johnson & Starley Main Injector Mk5 1000-0708140

Johnson & Starley

Johnson & Starley Main Injector Mk5 1000-0708140

Main injector Mk5 for Johnson & Starley JB25PB warm air units, controlling gas flow into the burner.

At a glance

  • Also known as 1690192
Manufacturer part no.
1000-0708140
GC number
E23-908
Showing prices

£12.70

£10.58 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 Main Injector Mk5 is a gas injector manufactured by Johnson & Starley for use in JB25PB warm air units. It meters and directs gas into the burner for controlled combustion. This component is specific to the JB25PB range and is identified by part number 1000-0708140.

Signs this part needs replacing

  • Burner fails to light or lights intermittently
  • Weak or uneven flame at the burner
  • Yellow or sooty flame indicating incorrect gas/air mixture
  • Visible damage, blockage or corrosion at the injector

Before you order

  • Check the appliance data plate for the model and mark number (e.g. JB25PB Mk1–Mk5).
  • Confirm the existing injector is marked Mk5.
  • Verify the part number 1000-0708140 against your appliance's parts list.

Not sure which part?

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