Worcester Bosch
Worcester Bosch Plunger 87035020370
A plunger for Worcester Bosch gas boilers, part number 87035020370.
At a glance
- Part type: Plunger
- Also known as 1011921
- If unsure, consult a Gas Safe registered engineer before ordering.
Showing prices
£10.60
£8.83 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 87035020370 is a plunger for Worcester Bosch gas boilers. It is a moving component within the boiler's internal assembly, typically involved in valve operation or flow control.
Signs this part needs replacing
- Boiler fails to fire or locks out intermittently
- Reduced or no hot water production
- Visible wear, sticking, or damage to the plunger
- Leaks or pressure loss around the valve assembly
- Unusual noises from the boiler during operation
Before you order
- Confirm your boiler model matches one of the listed fitments.
- Check the existing part number on the component you are replacing.
- If unsure, consult a Gas Safe registered engineer before ordering.
- Ensure the boiler is isolated and safe before any work.
Compliance
| GC number | E25-369 |
|---|---|
| Barcode / EAN | 4010009939801 |
| Alternative numbers | 1011921 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER BRITISH GAS JETATHERM WH1-FXN-GBNATGASRSF | — | — | — | |
| WORCESTER WR325 5AM1E23S0506 | — | — | — | |
| WORCESTER WR325 5AM1E31S0506 | — | — | — |
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.