Porter Cable FC350A Framing Nailer Fix 

I had no idea what was wrong ....this was great, THANK YOU

Excellent! Thank you!!

Hello, where did you get the part from?

EXACTLY what I needed. Helpful hint, DON'T leave your nail gun hooked up, I ran to the store to get a couple of things, and when I got back that seal had failed and the compressor was running, who knows how long...