Robinair's No. 62121 Enviro-Guard Hose for automotive R-134a service use meets all specifications for low permeation construction. This 96" long blue hose is clearly marked for R-134a, has a 500 psi working pressure, and 2500 psi burst pressure. Brass 14mm male X 1/2" ACME female fittings. 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.