The OEM radiator hoses experience the all to common hose collapse failures. Accufab has designed & developed the highest quality, internal stainless springs sold as a pair for the radiator-end and engine-end hoses. The springs easily insert and are strong enough to withstand, Accufab's not so scientific test of, human body weight demonstrated by their technical advisor, George Klass, standing on the actual radiator hoses. Accufab has tested them on an actual GT as well and found similar results, no hose collapse!