I recieved my overflow tank today and it fits where I wanted to mount it great. I had intended on using it for the radiator system, but I think I'm giong to try to use it for the S/C system. When I ordered it I thought it would have a pressure relief type of cap, but it doesn't. I want to mount a fitting in the bottom of it to place the large hose and turn the 90 degree fitting straight up to put the small hose. Now for the pressure relief to simulate the function of a radiator cap, there is a 3/8" fitting that is intended for the input on the side. Does anybody know of a pressure relief valve that would work in a 3/8th's hose application and what the lbs of relief it should be. I know most radiator caps are 7, 10, 12 or 15 PSI, but I have know idea what lbs of relief should be on the S/C system, here's the one I got so you can maybe understand wht I'm talking about doing - http://weapon-r.com/english/index.ph...oducts_id=5973