I remember my uncle telling me about this invention and I finally found it two years ago on Terry's site. It was invented in my home town by Laurence J. Parker, Guthrie, Okla

My grandpa use to work for him doing pump work out of his business downtown called "Parker Hardware Store" before my grandpa started his own business in 1964.

http://www.google.com/patents/US3733449


It just came around to late because Amtrol was already getting everybody to switch over to their tanks by 1973 and getting away from Standard tanks.


I though you might like to see it Speedbump, since you were in the business long before me and might have thought about making a patent yourself back then.