You are looking at a pair of brand new Adapters: 1/4 " X 1/4 " swivel female connector, straight adapter with Manual ball Valve. Does the Same Thing as YallowJacket items: Part Number: 25002 and 29980, but with less dead space(less non-compressible air to the system after each service). 2 in a package for the low Price. Needed by your AC service tools like manifold gauge to isolate the pressure or vacuum, preventing the "surprises" from happening. FEATURES: One end, 1/4" SAE Male flare the other end, 1/4 Female flare with swivel connector 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 to close. straight solid Brass body. Purpose of use: isolate the pressure or vacuum; or just make you manifold hoses "not-open-ended". 2 in package, one blue, one red on the valve handle Less dead space between connectors, means less non-compressible gas to the AC system. In stock and ready to ship. NOTE: other model/sizes of adapters and HVAC tools available at https://viot.us/HVAC