Plz your precius help.I just finished my 1st wc pc but when i try to use my leak tester,even in low pres,one tube from cpu to rad pops out.I really don't know what else to do.I changed my fittings with no luck. I'm using 16mm ek htc fittings and same size petg tubes.For some reason i used and bitspower petg 16mm tube i think in the ''faulty'' tube.