Potterton
Potterton O-Ring 18mm x 3mm 5142358
Potterton O-ring measuring 18mm x 3mm, part number 5142358, for Potterton Commercial Sirius 2 and Sirius 3 boilers.
£2.40
£2.00 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 Potterton O-Ring 18mm x 3mm (FS50 only) is a circular sealing component, part number 5142358, used within Potterton Commercial Sirius 2 and Sirius 3 boiler assemblies. It provides a fluid-tight seal at the joint where it is fitted, preventing weeping or loss of pressure from the connection. The 18mm x 3mm sizing identifies the ring's internal diameter and cross-section as supplied.
Signs this part needs replacing
- Visible water or weeping at the joint where the O-ring seats
- The ring is flattened, hardened or cracked once removed
- Persistent pressure loss traced to the sealed connection
- Swelling or deformation of the ring after exposure to system water
- Traces of scale or corrosion debris around the joint face
Before you order
- Confirm the O-ring dimensions required for the joint being worked on are 18mm x 3mm
- Check the appliance model against the Sirius 2 and Sirius 3 list above
- Verify the manufacturer part number 5142358 against the existing component or documentation
- Inspect the mating faces for damage before fitting the replacement ring
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| POTTERTON COMMERCIAL POTTERTON COMMERCIAL SPARES | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 FS50 | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 FS70 | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 WH50 (FROM APRIL 2016) | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 WH60 (FROM APRIL 2016) | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 WH70 (FROM APRIL 2016) | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 3 FS50 | — | — | — |
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.
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