M&R Sidewinder air clamp pressure

Hey all - I have an M&R Sidewinder with the side-clamp air system and I'm just now getting around to getting it all put in place - I of course don't have the manual since it was purchase used and have tried to check around for a PDF for the clamp system with no luck - just wondering if someone had an idea of the amount of air pressure that should run to the system?

I noticed its just basically an air chamber in the middle and didn't want to blow out a weld.

Any help would be appreciated.

Location: 
United States