What size tubing do I need for this JG fitting?

[Leann ull]

In this case Will they came from Cara and I know they were calibrated by the BOC guy as a favour to Cara

[Will_D]

Ok I am sure he did set the pressure but for what length of line?

[Leann ull]

Just spoke to an installer who used to work for sureserve before they were taken over earlier this year.
Full sp on these regs is that;
They are capable of serving 100l a min through 20 taps.
The manometer they use for calibration measures static and dynamic pressure.
They are set to 38 psi static.
They measure dynamic with a bleed valve.
The acceptable drop is 3 psi.
They don't measure line length, long lines just means more regs
"Volume" pubs used to have have them calibrated once every 12 months, but as they are "bombproof" they rarely need adjusting and every 3-5 years was the guesstimate for a 'high volume' Homebrewer.