PST went out of business a few years ago, and has been mentioned, the tanks legality in Canada is questionable. Fortunately (in the USA at least) the DOT exemption was renewed a few months ago, so these PST tanks are still legal in the USA. The exemption has to be renewed every few years, so in something like 3 or 4 more years it will have to be renewed once again by 'somebody'. If you search the threads there is a bunch of LONG stories/details about the exemption saga here in the USA for a bankrupt company like PST. If you buy PST HP tanks you will live in fear that one day the exemption will be allowed to die and those tanks will become paperweights, so you are taking your chances. I have no idea what the situation in Canada is, it was enough of a pain in the azz keeping with with the sorry saga here in the USA. I will keep my 6 HP PST tanks as long as I can, they're great tanks, just a victim of regulatory/economic bad luck.