Mastercool 45723 72" Red Charging Hose (1/4" SAE Fittings). Standard Hoses, Working Pressure 750 PSI, Burst 3000 PSI. Auto shut-off valves automatically retain refrigerant in the service hose when they are removed from the system, meet EPA, SAE, and UL standards for containment of refrigerant. Mastercool charging hoses stand the test of time. They are available in a wide variety of lengths. Nylon barrier models meet EPA, SAE and UL standards for containment of refrigerant. Standard hoses are an economical alternative. Knurled brass nuts make finger tightening easy. Crimped with 8 segment dies for secure fit and maximum durability. All are available in sets and individually. Standard hoses are designed for use of R12, R22 and R502. High pressure hoses are designed for use of R12, R22, R502, R404A, R407C, R507A, R134a and R410A.