[qcj]

That snap ring is 6" down into the cylinder. And if one could get the ring out there would be no way to pull O ring disc out. I is tight against the wall of the cylinder. It has to seal off air pressure when you push the dump switch. The top one was not easy pulling it 1/2". It needs to come out the bottom like the one did on top. The black plastic base looks like it might be threaded but when I turn it what it is threaded to turns also. I will keep working at it. Called Dupree but no help. Really did not know what I was talking about.

Steve or Richard have you ever taken one of these apart?