Quote:
Originally Posted by DampRobot
FYI, you can make and "end cap" on the black tanks by taking a short length of pneumatic tubing, folding it over on itself, ziptying it together, and sticking it in the NPT port of the tank. Worked well for us, and didn't leak in the slightest. Plus, it's super cheap.
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They also sell plugs on mcmaster.