DIN, yoke...choosing a reg isn't a joke!
Yoke regulator 1-st stage - on left, DIN - on the righ. A DIN regulator screws into a tank valve, and a yoke regulator fits over the top...
Birthday of Reg
First demand valve ever was invented in the mid 19 century! However, modern demand valve appeared almost 100 years later - in 1942...
