This knob has a large enough diameter that you can easily tighten the gas fitting. It also has the hex for the other end of the hose. I'm sure this will work for other applications as well. Propane hoses seem to have standard fittings. Sure beats finding a wrench every time you want to connect to a tank.

I use this for the Flame King weed burner. They didn't make it very ergonomic so I have been making parts to make it easier to use. I have another thing that adds a handle and lever for controlling the gas valve.

Also working on a strain relief for the hose.

No

0.2

20%

I used PETG which holds up really well in most of my projects. I would recommend 4 shells, then the infill isn't as critical