The part which you have selected is a genuine Ariston spare part, and is designed to fit an Ariston Eurocombi A23 and A27 MFFI CE gas combination boiler.

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

Compatible Parts:

By-Pass Spring - Part No. 998064 x2

O-ring - Part No. 998077 x2

The compatible Heating By-Pass Kit is not sold as a spare part. It is sold as part of the 3-Way Valve Group (Part No 998069).