I've been trying to chase down a leak in my fiancee's 94 Accord. I've replaced the O-rings going into the compressor twice now; the 134 leaked out the first time, and I'm waiting to see what happens this time.

I charged the system with 12oz today, and when I was finished, I noticed that there were some small air bubbles leaking from inside the low port. Is there a seal inside the stem, like on a tire valve stem? If so, is it replaceable without changing the entire hose?

I'd appreciate anyone's insight into this. Thanks!