Rad Valve/TRV sizes

[Plum Bob 66]

Hi

Just been to price up a job to excahnge 5 trvs like for like. The valves look to be a larger size than regular. Can you more experienced boys out there give a heads up on the different sizes.The connecting nuts to the tails look bigger than usual and im guessing they are 10 to 15 years old.

Regards
Plum Bob😕

 

[Gray0689]

Probably full bore valves

 

[tamz]

It will be half inch tails with 3/4 nuts. Just change the tails too.