Robinairs No. 60072 Enviro-Guard Hose Set for automotive R-134a service use meets all specifications for low permeation construction. This set of 72" long yellow, blue, and red hoses is clearly marked for R-134a use, has a 500 psi working pressure, and 2500 psi burst pressure. Brass 1/2 inch ACME female fittings on both ends (yellow hose) and 14 mm male x 1/2 inch ACME female fittings (blue and red hoses). Coupler nuts feature deep knurling for a positive grip that enables quick finger-tightening. A strong, six-sided crimp provides a reliable connection between the hose and barb, even at maximum pressure. Robinair premium refrigerant charging hoses are built for long life and dependability. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets, which includes the automotive aftermarket along with other industries such as agriculture and construction.