Originally Posted by Corran Horn
Those are still used on "RAP4" guns, and many other Chinese markers.... They're all tested/approved, but I do remember the originals.
They were not approved originally. At the field I worked for, they were on the "black list". Same for those small RAP4 tanks. I remember the RAP4 website used to list instructions on how to bypass DOT rules by filling your own tanks.
Yes, they might be DOT-approved now, with all the proper stamps. RAP4 is profitable enough now that I'm sure they want to avoid any liability problems. But that does not make them pre-DOT ones any more legal to fill/transport.
I think those tanks did not even have burst disc?