Hi Arnie, I forgot to mention - about the larger Propane Tanks - The larger ones do not require the OPD valve. That OPD is just for dummies using grills. Joe "Pip" Betz said that. jlb94 at juno.com - - - www.oldengine.org/members/betz ,-._,-. "What I can do, \/)"(\/ together we can do better." (R.W. Arbes) (_o_) http://community.webshots.com/user/pipbetz