The part which you have selected is a genuine Ariston spare part, and is designed to fit an Ariston Microsystem 10 & 15 RFFI gas system boiler.

It is recommended that only original Ariston parts are fitted to their boilers.

Please Note: The air pressure switch has been redesigned by Ariston and may differ in appearance from the original style. However, it will still fit and operate in the same way.