221988-1 is a BNC 50 ohm RF coaxial tee adapter designed for quick connect/disconnect applications using bayonet lock coupling. The adapter features a zinc body with nickel plating, phosphor bronze center contact with gold plating (50 microinches minimum thickness), and an acetal dielectric. Key dimensions include D: 32.54 mm (1.281 in), E: 23.62 mm (0.930 in), with an overall length of approximately 114.55 mm (4.510 in). This commercial-style connector is ideal for RF signal distribution and test equipment applications where reliable connections and low VSWR are required.