I am replacing the torch connection fittings on my water cooler with 5/8"-18 LH threaded fittings so it will work with my other torches. when I took the cover off the water cooler I noticed that on the water supply line to the torch there is a small 1/8" water line that goes from the original fitting back into the water tank. What is that line used for? and will it hurt anything if I dont use that line on the new setup? I will post some pics when I get a chance. Thanks