I installed this product in a 10 gallon igloo cooler with the standard pouring hole. https://www.amazon. com/Igloo-Gallon-Beverage-dispenser-Dispenser/dp/B000F6SHTK/ref=sr_1_1?ie=UTF8&qid=1493860503&sr=8-1&keywords=10+gallon+igloo+cooler one is on the right side of the picture next to the big nut too see) had to grind the inside a bit to fit the shoulder of the NPT nipple and not the final thread, but that's not a problem. It was really necessary to get the last 1/16 inch of depth required to install this cooler. For the radiator I also had to attach a large spacer and one of the small spacers inside the radiator as well as pipe tape on the threads to seal completely. I think if this was mounted in one metal wall it would probably be a bit to the other.
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