The Robinair 39072A 1/4" standard hoses with Quick Seal fittings feature a 500 psi working pressure; 2500 psi burst pressure. Robinair premium refrigerant charging hoses are built for long life and dependability. 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.