Robinair (62072 Enviro-Guard Hose for R-134a - 72", Blue 72 inch blue hose 740 PSI working pressure and 3700 PSI burst pressure A strong six-sided crimp provides a reliable connection between the hose and barb even at maximum pressure The coupler nuts are deeply knurled for quick finger-tightening Premium refrigerant charging hoses are built for long life and dependability