TRV valve top section thread size

[Meek]

I have bought a TRV valve to use the top section to replace a broken one on an existing valve. The new one has a larger thread size so won't screw on. Does anyone know if both thread sizes are available?

Many thanks if you can help.

M

 

[flameport]

There are several thread sizes, which one depends on the manufacturer of the valve and even between variants of similar looking ones (Myson being one culprit of that).

 

[Meek]

The existing one has acl Lifestyle on the top.

The ones that are too big are a Honeywell and a Screwfix one (SKU 60368-001)

Do you know what may replace the ACL valve?

 

[Dan Robinson]

M28

 

[Meek]

M28

Poo! I don't suppose you know which valve will be a direct replacement do you?

 

[HERTS P&D]

https://www.ebay.co.uk/itm/Myson-TR...Adapts-Old-Valves-For-New-Heads-/122360624199

Andy

 

[polesapart]

Drayton RT212