I want to thank fpresto for the informative info on the drain line. I guess I am just lucky. On all the drain lines I have modified I have never had a problem with bugs or high temperature's inside the ref. I have found a great way to install the screen to keep the bugs out rather than the cheap plugs you can buy. It's from a pressure washer it is a soap screen from the tube that goes into the soap container from a pressure washer. Fits right inside the tube and a 1/2 " clamp. If anybody is going to do this MOD. I recommend highly that you inspect thoroughly the way you are routing the tube below the trailer to be sure no wires, pipes, or any vital trailer mechanical/electrical component's are in the way before you start drilling holes.