Main
Main Diaphragm 7672027
Small diaphragm with a hole in the middle for the Main Mersey Super boiler diverter valve.
At a glance
- Part type: diaphragm
£12.48
£10.40 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 Main 7672027 is a small diaphragm with a hole in the middle, used in the diverter valve assembly of the Main Mersey Super boiler. The diaphragm responds to changes in water pressure across the valve, allowing the diverter to move between domestic hot water and heating modes. It is a serviceable wear part and is replaced when the valve stops operating correctly.
Signs this part needs replacing
- Domestic hot water demand does not trigger the boiler to fire
- The diverter valve fails to move between hot water and heating modes
- Hot water runs cold or only heats intermittently
- Water leaking from around the diverter valve housing
- The existing diaphragm is split, stretched or hardened
Before you order
- Confirm your appliance is a Main Mersey Super
- Check the GC number against your boiler's data badge
- Inspect the old diaphragm to confirm it is the small type with a hole in the middle
- Check the diverter valve housing for damage before refitting
Compliance
| GC number | 285-955 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN MERSEY SUPER | — | — | — | |
| MAIN MERSEY SUPER | 52-476-38 | 52-476-38 | — | — |
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.
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