Robinair (39072A 1/4" Standard Hoses with Quick Seal Fittings Set - 72", Set of 3 72 inch hose set color coded in red, yellow, and blue 500 PSI working pressure and 2500 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