Worcester Bosch
Worcester Bosch Seal 774600188A0
Worcester Bosch 774600188A0 seal for Greenstar gas boilers, providing a secure, airtight joint to prevent leaks and maintain dependable performance.
At a glance
- Part type: Gaskets, O-rings, seals and washers
- Appliance family: Worcester Greenstar
- Also known as 1030849
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£6.02
£5.02 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 Worcester Bosch 774600188A0 is a seal supplied for Worcester Bosch gas appliances. It sits at a joint within the appliance and provides a secure, airtight fit that prevents leaks and helps the boiler maintain dependable performance over its service life.
Seals of this type are classed as gaskets, O-rings, seals and washers, and are commonly replaced during servicing or repair work when the original has hardened, flattened or started to weep.
Signs this part needs replacing
- Water or condensate weeping from the joint the seal sits in
- Visible hardening, cracking, flattening or perishing of the seal material
- Scale or corrosion deposits around the sealing face
- Damp staining or residue on nearby components or casing
- Loss of system pressure that traces back to the sealed joint
Before you order
- Check the GC number and model on the appliance data badge against the compatibility list below; covered models carry GC numbers in the 41-406-xx, 47-406-xx and 47-800-xx ranges.
- Confirm the part number 774600188A0 or the alternative number 1030849 matches the item being replaced.
- Assess whether a full gasket or seal kit is needed if other seals in the same assembly are also worn.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Gaskets, Seals & Washers |
|---|---|
| Appliance family | Worcester Greenstar |
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 774600188A0 |
|---|---|
| GC number | J04-384 |
| Barcode / EAN | 4051516196875 |
| Commodity code | 4016 93 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1030849 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 1000 SERIES GR1000W 24 C NG | 47-800-38 | 47-800-38 | — | — |
| WORCESTER GREENSTAR 1000 SERIES GR1000W 30 C NG | 47-800-39 | 47-800-39 | — | — |
| WORCESTER GREENSTAR 12i ErP SYSTEM LPG | 41-406-24 | 41-406-24 | — | — |
| WORCESTER GREENSTAR 12i ErP SYSTEM NG | 41-406-23 | 41-406-23 | — | — |
| WORCESTER GREENSTAR 15i ErP SYSTEM LPG | 41-406-26 | 41-406-26 | — | — |
| WORCESTER GREENSTAR 15i ErP SYSTEM NG | 41-406-25 | 41-406-25 | — | — |
| WORCESTER GREENSTAR 18i ErP SYSTEM LPG | 41-406-28 | 41-406-28 | — | — |
| WORCESTER GREENSTAR 18i ErP SYSTEM NG | 41-406-27 | 41-406-27 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 25 C LPG | 47-800-27 | 47-800-27 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 25 C NG | 47-800-26 | 47-800-26 | — | — |
Showing 10 of 123 compatible appliances.
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.
manual
WORCESTER appliance manual — GREENSTAR 12i ErP SYSTEM LPG (GC 41-406-24), GREENSTAR 12i ErP SYSTEM NG (GC 41-406-23), GREENSTAR 15i ErP SYSTEM LPG (GC 41-406-26), GREENSTAR 15i ErP SYSTEM NG (GC 41-406-25), GREENSTAR 18i ErP SYSTEM LPG (GC 41-406-28), GREENSTAR 18i ErP SYSTEM NG (GC 41-406-27), GREENSTAR 21i ErP SYSTEM LPG (GC 41-406-30), GREENSTAR 21i ErP SYSTEM NG (GC 41-406-29), GREENSTAR 24i ErP SYSTEM LPG (GC 41-406-32), GREENSTAR 24i ErP SYSTEM NG (GC 41-406-31), GREENSTAR 9i ErP SYSTEM LPG (GC 41-406-22), GREENSTAR 9i ErP SYSTEM NG (GC 41-406-21)
manualmanualWORCESTER appliance manual — GREENSTAR 25SI COMPACT LPG (GC 47-406-51), GREENSTAR 25SI COMPACT NG (GC 47-406-50), GREENSTAR 30 SI COMPACT LPG (GC 47-406-53), GREENSTAR 30 SI COMPACT NG (GC 47-406-52)
manualmanualWORCESTER appliance manual — GREENSTAR 25Si ErP COMPACT LPG (GC 47-407-74), GREENSTAR 25Si ErP COMPACT NG (GC 47-406-73), GREENSTAR 28Si ErP COMPACT, GREENSTAR 30Si ErP COMPACT LPG (GC 47-406-76), GREENSTAR 30Si ErP COMPACT NG (GC 47-406-75)
manualmanualWORCESTER appliance manual — GREENSTAR 25i ErP COMBI LPG (GC 47-406-61), GREENSTAR 25i ErP COMBI NG (GC 47-406-60), GREENSTAR 30i ErP COMBI LPG (GC 47-406-63), GREENSTAR 30i ErP COMBI NG (GC 47-406-62)
manualmanualWORCESTER appliance manual — GREENSTAR 27I COMPACT SYSTEM LPG (GC 41-406-14), GREENSTAR 27I COMPACT SYSTEM NG (GC 41-406-13), GREENSTAR 30I COMPACT SYSTEM LPG (GC 41-406-16), GREENSTAR 30I COMPACT SYSTEM NG (GC 41-406-15)
manualmanualWORCESTER appliance manual — GREENSTAR 27Ri ErP COMPACT LPG (GC 41-406-55), GREENSTAR 27Ri ErP COMPACT NG (GC 41-406-54), GREENSTAR 30Ri ErP COMPACT LPG (GC 41-406-57), GREENSTAR 30Ri ErP COMPACT NG (GC 41-406-56)
manualmanualWORCESTER appliance manual — GREENSTAR 27i ErP SYSTEM COMPACT LPG (GC 41-406-59), GREENSTAR 27i ErP SYSTEM COMPACT NG (GC 41-406-58), GREENSTAR 30i ErP SYSTEM COMPACT LPG (GC 41-406-61), GREENSTAR 30i ErP SYSTEM COMPACT NG (GC 41-406-60)
manualmanualWORCESTER appliance manual — GREENSTAR 28 CDI COMPACT LPG (GC 47-406-45), GREENSTAR 28 CDI COMPACT NG (GC 47-406-44)
manualmanualWORCESTER appliance manual — GREENSTAR 28CDi ErP COMPACT LPG (GC 47-406-78), GREENSTAR 28CDi ErP COMPACT NG (GC 47-406-77), GREENSTAR 32CDi ErP COMPACT LPG (GC 47-406-80), GREENSTAR 32CDi ErP COMPACT NG (GC 47-406-79), GREENSTAR 36CDi ErP COMPACT LPG (GC 47-406-82), GREENSTAR 36CDi ErP COMPACT NG (GC 47-406-81)
manualmanualWORCESTER appliance manual — GREENSTAR 32CDI COMPACT LPG (GC 47-406-47), GREENSTAR 32CDI COMPACT NG (GC 47-406-46), GREENSTAR 36CDI COMPACT LPG (GC 47-406-49), GREENSTAR 36CDI COMPACT NG (GC 47-406-48)
manualmanualWORCESTER appliance manual — GREENSTAR RI 27KW COMPACT LPG (GC 41-406-18), GREENSTAR RI 27KW COMPACT NG (GC 41-406-17), GREENSTAR Ri 30KW COMPACT LPG (GC 41-406-20), GREENSTAR Ri 30KW COMPACT NG (GC 41-406-19)
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