This design uses a plastic, insulated drink cooler with spigot removed. There is then a valve attached to PVC pipe and fittings, where the nipples are then attached.




Finished Product:


Ball valve to shut off water:


Electric fish tank heater, 50 watt, good for up to 15 gallons of water. Auto temperature control, 78 degrees.


Installed nipple, screw-in style with silicone caulk around the base: