Worcester Bosch
Worcester Bosch Diaphragm Pack of 10 87005030500
Diaphragm pack of 10 for the diverter valve assembly in Worcester Bosch gas boilers, manufacturer part number 87005030500.
At a glance
- Also known as 1011735
£12.73
£10.61 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The diaphragm is a flexible rubber component used in the diverter valve assembly of Worcester Bosch gas boilers. It responds to pressure changes within the valve to move the diverter spindle between heating and hot water modes. This item is supplied by Worcester Bosch as a pack of 10 under part number 87005030500.
Signs this part needs replacing
- Hot water demand does not switch the boiler from heating to hot water mode
- Heating circuit warms when only hot water is drawn
- Radiators heat up during a hot water draw-off
- Poor or inconsistent domestic hot water temperature
- Visible splitting, hardening or perishing of the diaphragm on inspection
Before you order
- Confirm your appliance model against the fitment list above
- Check the existing diaphragm and diverter valve assembly for wear before ordering
- Confirm the part number 87005030500 matches the component being replaced
- Consider how many diaphragms are required for the job, as this item is supplied in a pack of 10
Compliance
| GC number | E49-920 |
|---|---|
| Barcode / EAN | 4010009394686 |
| Alternative numbers | 1011735 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER BOSCH W1359KV1B31S0595 | — | — | — | |
| WORCESTER BOSCH W135KV1B31S0595 | — | — | — | |
| WORCESTER BOSCH W135KV1P31S0595T1 | — | — | — | |
| WORCESTER BOSCH W2751KV1B31S0595 | — | — | — | |
| WORCESTER BOSCH W2751KV1P31S0595 | — | — | — | |
| WORCESTER BOSCH W3501KV1B31S0595 | — | — | — | |
| WORCESTER BOSCH W3501KV1P31S0595 | — | — | — | |
| WORCESTER BOSCH W4001KV1B31S0595 | — | — | — | |
| WORCESTER BOSCH W4001KV1P31S0595 | — | — | — | |
| WORCESTER BRITISH GAS GREENSTAR CC1-FSN-GB NG 29KW COMBI | 47-108-05 | 47-108-05 | — | — |
Showing 10 of 33 compatible appliances.
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.
WORCESTER appliance manual — BRITISH GAS GREENSTAR ICC2-FSN-GB NAT 30KW COND COM (GC 41-108-09), BRITISH GAS GREENSTAR ICC2-FSN-GB NAT 37KW COND COM (GC 41-108-10)
manualmanualWORCESTER appliance manual — GREENSTAR 25 HE (GC 47-311-73), GREENSTAR 30 HE COMBI (GC 47-311-74)
manualmanualWORCESTER appliance manual — GREENSTAR 30 HE PLUS COMBI (GC 47-311-75), GREENSTAR 35 HE PLUS COMBI (GC 47-311-76), GREENSTAR HE PLUS-FSN-GB35KW (GC 47-311-57)
manualmanualWORCESTER appliance manual — GREENSTAR R25HE COMBI (GC 47-311-77), GREENSTAR R30HE COMBI (GC 47-311-78)
manualmanualWORCESTER appliance manual — GREENSTAR R30HE PLUS COMBI (GC 47-311-79), GREENSTAR R35HE PLUS COMBI (GC 47-311-80), GREENSTAR R40HE PLUS COMBI (GC 47-311-81)
manualmanualWORCESTER appliance manual — GREENSTAR RSF COMBI NG (GC 47-311-44), GREENSTAR ZWBR 11-25 A31 LPG (GC 47-311-45)
manualNo 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.