Leaking Air Line into Air Tank

You guys do know that you can replace the orings inside the push lock fittings, right? They're about a nickel a piece at the dealer

 

Push the metal ring in, pull the hose out. Make sure that all the hose is out, that you haven’t broke it and left part of it inside. Now pull the ring completely out off the fitting (may need to use a tool). Next step is to find something to pull the rubber oring out off the fitting. It sitts deep in there. A paper clip bent properly should work well. Pull the worn oring out, push a new one in all the way down. Put the metal ring back in place. Clip the hose. That’s it.