[77newell]

Your use of the word "bolt" is a bit confusing to me, I will offer perspective on what I think you meant given the picture you posted.

After blocking up the coach, use the leveling system to exhaust the air from the air bag. Then, use a wrench on the lower hex in the picture to keep it ftom rotating while you use another wrench to loosen the hex just above the one you are holding. Once the elbow is loose, move it out of the way and remove the fitting from the air bag, do not just tighten it. Once removed, clean the threads on both the fitting and the air bag. Then apply thread sealant to the threads on the fitting that go into the air bag. Install the fitting and tighten it until it makes you grunt just a bit. Then, connect the elbow and, while holding the fitting you just installed to prevent it from turning, torque the nut on the elbow until it to makes you go softly "unh". The torque values are the ones I've successfully used. Air up the system and check for leaks.