Quote Originally Posted by ChrisW6
There are two types as far as I know, DIN fitting and A Clamp fitting..

The DIN has a female screw that you screw the hose into and the A clamp hose fits over the top and tightens with a hand screw knob..
A Clamp is Made for 207 & 232 Bar
Not Suitable for 300 Bar

Din Gauges are suitable for 300 Bar

MDE Air Gun Gauges are more compact and only need testing every Five years
Against every 2- 3 years for other types , A & Din

Check out Precharge Section on
www.midlanddiving.com

Basically They was made for Diving
300 Bar are more for Air Gunners

20 & 232 are Cheaper as thinner walled than 300 Bar
But 300 Bar holds a lot more Air Under preasure

Not forgetting that most filling stations charge
the same regardless of bottle or Bar load.

BOB/R