[Richard Groves]

Evening all.
I need to order some john guest tubing and taps to ressurect my ro in new home.
Sorry for the stupid question but when measuring it, is the sizing the outside diameter ?
I've only some small off cuts to go by and a handful of  pushfit elbows.
I'm pretty certain they are 1/2" od but just wanted to make sure before I ordered anything. 

[Richard Groves]

Its 1/2" for sure just checked jg's site ( should have done that all along ) 

[Stoots]

If john guest at the sizes, they are probably only approximate anyway.

[Richard Groves]

If john guest at the sizes, they are probably only approximate anyway.

[Shrek]

I thick screwfix sell John guest fittings / tubes - might be an idea to nip into one

[Richard Groves]

I thick screwfix sell John guest fittings / tubes - might be an idea to nip into one

Thanks Shrek but think they just do the common  plumbing sizes of. 15 and 22 mm.  All sorted now and ordered from G's.