Swagelok Brass Union Tee, 0.125 in.For Swagelok tube fittings. Swagelok fittings are easy to install and come in a wide variety of configurations. They form gas-tight seals that are resistant to vibration fatigue and capable of withstanding high-pressures, vibrations, and temperature changes. The patented advanced-geometry back ferrule design provides a leak-tight tube connection on all Swagelok stainless steel tube fittings of identical sizes. Style: Tee Connection 1: 1/8 inch Swagelok Tube Fitting Connection 2: 1/8 inch Swagelok Tube Fitting Connection 3: 1/8 inch Swagelok Tube Fitting