Help - New Actuator Head won’t fit

[Bling]

Hi,

I hope you are able to help me please. My actuator head is no longer working for underfloor heating.
I couldn’t find the same model online, so I bought one that had the same wiring in Hope it would fit … but the brass fittings are different & I don’t want to have to drain the system down.

I have attached photo of original part, current brass fitting, part that the new one needs to fit in to ‍

Any recommendations please

 

[flameport]

Use the isolator handle directly below.
Release any pressure in the system
Undo the other end, only a small amount of water will be lost.

No need to 'drain down' anything.

 

[Razor900]

Thats an old Polypipe valve. They were made by ESI. Get the correct replacement and it will snap right on and just plug it in