Robinair 72 inch Set Of Three Color-Coded Enviro-Guard Hoses for R-134A 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. Enviro-Guard hoses are ideal for high pressure applications. The 96 inch hose set is color coded in red yellow and blue. It meets all specifications for low permeation construction. Its clearly marked for R-134a; 740 psi working pressure and 3700 psi burst pressure.