54mm copper off the ark!

[CharterGAS]

have a BIG building i look after that has a 2" copper outlet of a tank that holds around 1000L . everything is pretty much originally form 1964
can you tell me 54mm has changed diameter from back then???

 

[justlead1]

Hi Noah here. I may well have fitted it. At that time it will be 2" BSS. 659 it had a thicker wall than the metric sizes we use now. Sorry can not remember if the OD. changed