HCPRO Hoses are built to last, Feature an Adjustable valve core depressor to compensate with valves that are out of tolerance, Nylon permeation barrier (Meets SAE J2196 / SAE J2888) & EPA requirements for strength, pressure and refrigerant permeation, also multi-layer reinforced hose compatible with CFC, HCFC, HFC Refrigerant blends. Maximum working pressure 800 PSI, 4000 PSI burst. Color coded Handles for easy connection. Made in USA