
I went to the LHBS yesterday afternoon and ended up staying there for about 90 minutes talking and drinking beer with the guy who works there... I have known him from various brewing circles for years. He filled one of my CO2 tanks and when I asked about a "washer", he suggested these threaded pieces that have a gasket on them. They were 2.50 each and I picked up 3 of them. They connect to the tank and look like they would eliminate any leaking issues one might have with the cardboard or plastic washers.