those are the Genesis tanks, I like them better, but it is harder to find the valves. They also are 300 bar so you would need a 300 bar din.
The service pressure of the tank is 3,500 psig (not 300 Br = ~4,410 psig). But, yes, it requires a 300 Br DIN tank valve. (This is probably what you meant to write.)
Safe Diving,
rx7diver