Bill, yours is more of the “industry standard”
I’d been using a smaller one for the past couple of years but got this bigger one since it was on sale, and had a higher pressure rating. That said, I must stress the importance of eye protection.
I remember looking for Cornelius keg equivalents here in the PI when I wanted to make a pressure pot a long time ago. There were none, so I settled on the filter housings.
For even bigger projects (like testing canister lights and larger camera housings), I’m experimenting with a 155mm howitzer propelling charge canister. It’s got a great o gasket, and even though the base is plastic (probably a blowout safety precaution), it can take and hold quite a bit of pressure.