BillP
Senior Member
When would you say that K-valves became the clear standard in the marketplace and replaced J-valves to the point that you would have had a hard time buying a new tank with a J-valve?
And when would you say the same thing about plastic cylinder valve knobs replacing metal knobs (on even K-valves) making it hard to find a new tank with a metal valve knob? Was there a time when J-valves had plastic knobs?
Just curious
And when would you say the same thing about plastic cylinder valve knobs replacing metal knobs (on even K-valves) making it hard to find a new tank with a metal valve knob? Was there a time when J-valves had plastic knobs?
Just curious