8 outlets allow you to adjust air flow for 8 fish tanks Inlet connector Diameter: 3/8 inch and the 8 OUTPUT Diameter measure 3/16". Manually control the flow of vital O2 or switch an air pump on or off. Made of Chromium Copper material, air will never leak out. Weighs 0.4 pound, Measures 6.3 x 2.3 x 0.25"
