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Isolating Valve 3/4 Return

Part number (MPN)
999582
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Source
retailer parts list
checked 2026-11-06
Fitting notes

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

Compatible appliances

Always check the model and serial number on the data plate before ordering.

Frequently asked questions

Which appliances does 999582 fit?

The sources we checked list 999582 (Isolating Valve 3/4 Return, Ariston) for: Ariston ACO 27 Mffi Met Edition 2, Ariston ACO 27 RFFI System, Ariston ACO 32 Mffi Met Edition 2, Ariston ACO 32 RFFI System, ECOSYSTEM 27 RFFI from serial, MICROCOMBI 27 MFFI from serial. Always check the model and serial number on the data plate before ordering.

Does 999582 have equivalent or superseded part numbers?

The sources we checked list no equivalents for 999582. Ask a Ariston stockist to confirm.

What should I check before fitting 999582?

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

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Some lists are dated and the part may have been superseded. Information only, compatibility not guaranteed.