valve (gas) knob, 1/2 inch square drive
thingiverse
I've got my natural gas supply line hooked up to my grill with a 1/2 inch square nub that lets me turn the gas flow on or off. Instead of lugging around a wrench every time, I came up with this knob designed specifically for the square! Fingers crossed it does its job! I've included both STL and 123D files for your reference
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