No idea on those details, gasman. It's sold as a
replacement for VW Vanagon tanks and is made by a well known manufacturer (Manchester), but beyond that - none of that info is listed in the specs or manual that I can see. This blurb is included in the description, but is pretty generic:
"Our tanks are manufactured by the OEM supplier, Manchester Tank. They are compliant with all Federal Regulations and are a direct bolt-in replacement for all Volkswagen Bus / Vanagon applications."
I'm in NW Washington. I've called every propane company and retailer within a 60 minute drive.