Robinair's No. 18191A Low-Side Service Coupler featurs manual operation and a red actuator. This coupler is designed for use with Robinair Enviro-Guard hoses to allow access to service ports on automotive R-134a A/C systems. Quick-connect design has an integral safety sleeve that protects against injury and refrigerant loss if the coupler is disconnected under pressure. The compact design easily fits into tight quarters - especially handy for retrofits. 6-ball coupler design provides a more stable grip on the fitting than lesser 4-ball designs. 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.