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Johnson & Starley Expansion Vessel Unvented Kit Spares 1000-0704200

Johnson & Starley

Johnson & Starley Expansion Vessel Unvented Kit Spares 1000-0704200

Expansion vessel for Johnson & Starley unvented kit spares, part number 1000-0704200.

At a glance

  • Also known as 1691390
Manufacturer part no.
1000-0704200
Showing prices

£342.91

£285.76 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 Johnson & Starley expansion vessel is a component supplied for unvented kit spares. It accommodates the expansion of heated water within a sealed unvented system, helping to keep system pressure within its normal operating range. This item is listed under Johnson & Starley part number 1000-0704200.

Before you order

  • Confirm that part number 1000-0704200 matches the item specified in the unvented kit or system documentation.
  • Check that an expansion vessel is the correct component for the fault or maintenance task in hand.
  • Verify the vessel's connection arrangement against the existing installation before ordering.
  • Ensure the system is depressurised and drained as required before any removal or fitting work.

Not sure which part?

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