Ariston
Ariston O-Ring 999325
Ariston 999325 O-ring for ACO 35 HP MFFI and Microgenus II MFFI and System RFFI boilers.
At a glance
- Part type: O-ring
- Also known as 1577546
£3.84
£3.20 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 Ariston 999325 is an O-ring used in Ariston gas boilers, including the ACO 35 HP MFFI and Microgenus II ranges. It forms a compression seal at the joint where it is fitted, preventing water or gas from escaping past the mating faces. It is a service part intended for replacement whenever the joint is disturbed or the seal has degraded.
Signs this part needs replacing
- Visible weeping or a trace of water at the joint the O-ring seals
- Water staining, corrosion or scale around the mating faces
- The O-ring is cracked, flattened, hardened or perished
- The seal has been disturbed during servicing and will not reseat reliably
- A joint that continues to seep after being tightened
Before you order
- Confirm your appliance model against the fit list above
- Check the existing part or the manufacturer's parts list for part number 999325
- Inspect the joint for other damaged seals or washers that may also need replacing
- Replace the O-ring whenever the joint is opened, as re-used seals may not seal correctly
Compliance
| Barcode / EAN | 5411692329303 |
|---|---|
| Alternative numbers | 1577546 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ARISTON ACO 35 HP MFFI UK | 47-116-35 | 47-116-35 | — | — |
| ARISTON MICROGENUS II 24 MFFI UK LPG | — | — | — | |
| ARISTON MICROGENUS II 24 MFFI UK MET | 47-116-25 | 47-116-25 | — | — |
| ARISTON MICROGENUS II 28 MFFI UK LPG | — | — | — | |
| ARISTON MICROGENUS II 28 MFFI UK MET | 47-116-26 | 47-116-26 | — | — |
| ARISTON MICROGENUS II 31 MFFI UK LPG | 47-116-27 | 47-116-27 | — | — |
| ARISTON MICROGENUS II 31 MFFI UK MET | 47-116-27 | 47-116-27 | — | — |
| ARISTON MICROGENUS II SYSTEM 24 RFFI UK MET | 41-116-19 | 41-116-19 | — | — |
| ARISTON MICROGENUS II SYSTEM 31 RFFI UK MET | 41-116-21 | 41-116-21 | — | — |
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.
ARISTON appliance manual — ACO 35 HP MFFI UK (GC 47-116-35)
manualmanualARISTON appliance manual — MICROGENUS II 24 MFFI UK LPG, MICROGENUS II 24 MFFI UK MET (GC 47-116-25), MICROGENUS II 28 MFFI UK LPG, MICROGENUS II 28 MFFI UK MET (GC 47-116-26), MICROGENUS II 31 MFFI UK LPG (GC 47-116-27), MICROGENUS II 31 MFFI UK MET (GC 47-116-27)
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.