You are looking at a pair of brand new Adapters: 1/4 " X 5/16 " swivel female connector, straight adapter with Manual ball Valve , Needed by your AC service tools to attach to AC systems/tools with 1/4" SAE to system port with 5/16 SAE connector for recovery/charging/diagnosis, adding oil/dye, etc.)! Its the same size and does the same thing as Yellowjacket item 41124; PLUS a hand valve on each adapter, 2 in a package for the low price. FEATURES: One end, 1/4" SAE Male flare the other end, 5/16 Female flare The female connector has the valve depressing device to open the valve when engaged Stainless steel ball valve in between. 1/4 turn to full open or close. straight solid Brass body, no hose. Purpose of use: Serve as a connector/converter/adapter between 1/4 " SAE service tool to work on 5/16" system ports. 2 in package, one blue, one red on the valve handle Less dead space between connectors, means less non-compressable gas to the AC system. In stock and ready to ship. NOTE: other model/sizes of adapters available 1/4" SAE) to 5/16" and 1/2" ACME in different combinations, make sure to get the right adapter you need.