Yep, i thought it might be but wasnt sure if the G ment it was the finer thread type you often see in industry for compression type fittings... being BSP makes it even better...

Also yeah i figured 1000psi which most roboteers seem to state isnt really true... i figured it would be around 750psi max as thats when co2 becomes liquid?

If you pay the exstra £2 or whatever it comes with a certificate... which means it should be allowed within the FRA rules IMO.

@John;

Burst discs dont go at 1000spi... the 1000PSI PRV rule was put into place to protect against components rated to 1000psi tops... so if someone turns up to an event with a buffer tank theyve tested at 1000psi... they wont risk letting that component go over pressure.... (Sorry if thats teaching you to suck eggs, i guess you already know that)