Bill, I thought it was supposed to be a flat ring too after looking at my old one but it was just flatened out from age. Trust me it's supposed to be an O-ring. I bought a fat one and a skinny one. The fat one wouldn't let the valve go into the core far enough. The skinny one worked fine. Sorry but I don't remember the exact size. I took the valve with me to the hardware store and found one that fit. Dan Bill Maurits wrote: > > SORRY that was supposed to be FLAT ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.