Here are a couple pics of the o-rings under the bleeder valve.
First remove the bleeder valve screws and take off the top part. The base with the screw holes looks like it's part of the tank but it's actually a separate piece. Take a big pair of channelocks and wiggle it a little, then pull it straight up.
This is what's under the base and where the two o-rings live. It fixed mine for a few months. No condensation but this past summer the tank cracked on the bottom so the parts you see are no longer on my car.
