Originally Posted by FlyingHellFish
I like the fact that you can disconnect the solenoid and not have to carry the adapter around. And that grey adjustment knob fits perfectly with the silver colour scheme. Why do they change the colour? I seen red, black and white 312 Concoa handles, do they change it base on year?
Different buyers want their version to stand out as their products. The concoa knobs are black. The praxair version is red sometimes black with a green sticker. The boc version is white.
Airgas is a good example of this. They want a blue knob. If they can't get one, they stick a blue airgas sticker on it.