Ideal Isolation Valve 12.7mm Domestic Hot Water 172543

This is a 12.7mm domestic hot water isolation valve manufactured by Ideal, supplied under part number 172543. It sits on the domestic hot water circuit, typically beneath the appliance, and allows the water supply to be shut off at the boiler rather than at a distant stopcock. The valve is used across the Ideal Europa and Mini boiler ranges.

• Water weeping from the valve body, the spindle or the compression nut
• The handle turns but the flow does not stop, so the DHW circuit cannot be isolated
• A stiff, seized or rounded-off handle that will not move by hand
• Scale or corrosion deposits around the outlet, often with a drip running down the pipework
• Damp staining on the casing or floor beneath the appliance

• Check the appliance model and its GC number against the compatibility list before ordering, as the valve is shared across several Europa and Mini variants.
• Confirm the 12.7mm connection size matches the pipework on the DHW circuit.
• Note the alternative number 1178883 when cross-referencing an older stock listing or an engineer's note.
• Work on the appliance only with the water and power isolated, and follow the manufacturer's instructions for depressurising the DHW circuit.