Originally Posted by S10xGN
I'd like to know too. I replaced all my couplers with Milton hi-flo's a few years back (don't remember the part number) and most of them leak enough when left coupled that I can no longer leave them coupled unless I'm using them. My compressor went from cycling every 20 or 30 minutes to once or twice a day. Besides that, they're much hard to assemble when pressured up.
Milton has repair kits for many of their couplers.