Robinairs No. 10328 Hose Extension Coupler fitting for A/C charging and recovery use features 1/2 inch male ACME X 14mm female threads. Cast and precision machined brass construction ensures reliable performance and long term durability. Coupler only - does not include a schrader valve so it will not shut off flow when unthreaded. Sold individually. 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.