Premium 9' - “Enviro-Guard” hoses are built for long life and dependability and are ideal for high pressure applications. For recharging models 34788, 34288, 34134Z. Strong six-side crimp provides a reliable connection between the hose and barb. Coupler nuts are deeply knurled for quick finger-tightening. Meet all specifications for low permeation construction. Clearly marked for R-134a. Fittings are 1/2” ACME x 1/2” ACME for the yellow hose and 14mm x 1/2” ACME for the blue and red hose. Working pressure: 740 PSI. Burst pressure: 3700 PSI.