I found this to use as a drain port in the electrical section. 3/4" threads on one end with an o-ring against the flange. Picked up another o-ring in the hose repair section, and sandwiched them on each side of the tank (not tested yet). The flange on the other will accept a 5/8" hose and clamp. Then I'll just add a hose on/off switch for a couple of bucks.
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