You can use pass through shanks to let beer through the wall of a cooler. Drill a 1″ hole through the cooler, slide in the shank, and use the two attached nuts to fasten it to the cooler. Be sure you have nuts and nipples of the size line you are working with as well as oetiker clamps. We typically use these on our jockey boxes with wingnuts so we can store the beer lines inside for clean-up. Pass through shanks can also be used to put through the side of a refrigerator to pass a gas line through.