| to find out if its the can, remove the regulator completely.
no air should come out what so ever as they have a valve that lets the air out when the screw goes down into it.
so if no air comes out (maybe hold in underwater in the bath to look for bubbles) then its not the can.
then try re-ataching the the regulator and screwing it down so the air starts comming out (make sure the air hose is attached firmly) and submerse the can and regulator under the water (make sure the air hose is out the water as air will obvioulsy come out of that!)
hey presto....you should be able to see where the leek is!!! |