Sime
Sime Air Diaphragm 6028642
30 mm air diaphragm for Sime gas boilers, part number 6028642.
At a glance
- Also known as 2040306
Showing prices
£3.04
£2.53 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 Sime 6028642 is a 30 mm diameter air diaphragm for Sime gas boilers. It is a flexible component that moves in response to pressure changes within the boiler's air circuit. It is listed for Format and DEWY ZIP models.
Signs this part needs replacing
- Boiler fails to ignite or locks out
- Unstable or fluctuating flame
- Whistling or fluttering noise from the air circuit
- Diaphragm shows splits, hardening or distortion
- Combustion readings drift out of tolerance
Before you order
- Confirm your boiler model against the fit list above
- Check the existing diaphragm diameter is 30 mm
- Verify the part number 6028642 matches your boiler's parts list
- Inspect the diaphragm housing for damage before fitting
Compliance
| Alternative numbers | 2040306 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| SIME DEWY ZIP BF 30 SOLAR MET - 8101216 | — | — | — | |
| SIME FORMAT 30 HE - 8101206 | 47-719-22 | 47-719-22 | — | — |
| SIME FORMAT DEWY ZIP 30 BF GPL - 8101203 | — | — | — | |
| SIME FORMAT DEWY ZIP 30 BF MET - 8101202 | — | — | — | |
| SIME SIME FORMAT 30 HE | — | — | — |
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.