Nature2 W13042 Winter Drain Plug
thingiverse
Used the 1/4" NPT as the base of this remix. Made it solid and added a finger-friendly top using TinkerCAD. My original drain plug got involved in a terrible weed-eater confrontation and though it survived, it developed a small but annoying leak. Finally got around to engineering a fix at a print cost of 5 cents instead of the $10 online vendors were requesting. I used PLA, 20% infill, and no support with thread side down. For me, it's water-tight even without plumbers tape.
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