The reg is built into the Asa. You need to take the hose off and unscrew the silver front from the black part of the drop forward with a wrench to get into it. There should be a spring washer stack so pay attention on how they come out. You probably have a bad oring somewhere in there if it's been sitting for a long time.
Dark Vampire SL8r
"If at first you don't succeed, destroy all evidence that you tried."