Horizontal Propane Tanks with Old-Style Valve in AK?

I've pumped propane in my duties as a camp host.....somebody does not know the propane regulations as well as they should. Horizontal propane tanks are exempt from the OPD regulations. Horizontal tanks used in fork lifts, boats and motorhomes, and other gases used for welding ect.

http://www.nfpa.org/safety-information/for-consumers/gasoline-and-propane/propane-safety/propane-cylinder-overfilling-prevention-devices