G1/4 plug
thingiverse
Delrin Reservoir Cap Fill Port Plug. A G1/4 plug designed to fit snugly into the delrin reservoir cap, ensuring effortless filling and emptying. Optional O-Ring sealing can be added, but I've chosen to forego it as the fill port remains submerged at all times. To facilitate smooth insertion and removal, apply a small amount of silicone grease to the plug's threads.
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