Aeroquip Performance Teflon hose with stainless steel overbraid. Ferrules are 11/32" OD brass tubing, 5/16" ID, crimped with CATV cable connector crimping tool. Tested to 90 PSI with compressed air. Good hose, but not very flexible. It is necessary to heat hose barbs or use an installation tool to get the barbs seated properly. The hose is too stiff to get all the way on the barbs by hand.