Robinair's R-134a Enviro-Guard hose set for 34788, 34288, 34134Z RRR machines features a pair of 9' long hoses (red/blue). Enviro-Guard hoses incorporate a special barrier material which meets all specifications for low-permeation construction and virtually eliminates any permeation of refrigerant, while remaining flexible for ease of use. Hoses are clearly marked for R-134a use and feature a working pressure of 740 psi and a burst pressure of 3700 psi. Made in the USA. 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.