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Bruce
Herd Master
Yep I have an aquarium heater in the 5 gallon drink cooler, the lowest it goes is 65°F. The water is continually pumped with a tiny reptile waterfall pump down through the 16" pipe that has the 2 horizontal nipples in it then back to the cooler. Must be some water froze around the pin on the outside of the nipple. These are the ones I got from Meyers Hatchery. No instructions, maybe I put them in upside down? I have the wide flattish part on the bottom.