Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Worcester Bosch Isolating Valve Cold Mains 8737603031

Worcester Bosch

Worcester Bosch Isolating Valve Cold Mains 8737603031

Cold mains isolating valve, part 8737603031, for Worcester Bosch Greenstar 2000 Combi and Greenstar combi appliances.

At a glance

  • Part type: isolating valve, cold mains
  • Also known as 1038299
Manufacturer part no.
8737603031
Showing prices

£59.06

£49.22 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 Worcester Bosch isolating valve cold mains is a service valve used on the cold mains inlet to the appliance. It is manufactured by Worcester Bosch and fits the Greenstar 2000 Combi range and related Greenstar combi models listed below. Its function is to allow the cold water supply to the appliance to be shut off for servicing or repair.

Signs this part needs replacing

  • Water weeping from the valve body or spindle
  • The valve will not fully shut off the cold mains feed to the appliance
  • Stiff, seized or rounded operating screw that cannot be turned
  • Inlet supply cannot be isolated for servicing work

Before you order

  • Confirm the appliance model matches one of the fit lines above
  • Check the LPG or NG variant of the appliance against the model listing
  • Verify the existing valve part number 8737603031 before ordering
  • Isolate the water supply before removing or fitting the valve

Not sure which part?

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