Zeroyoyo Silver Color Stainless Steel 4 Way Air Flow Splitter Pump Valve Tap for Aquarium Fish Tank Material: Stainless Steel Overall size(L*W*H): 93 x 29 x 22mm / 3.7" x 1.1" x 0.85"(L*W*H). Fit 4mm standard aquarium air line/tubing. Branch outlet valve: 3.2 mm (diameter); Outlet diameter: 3.4 mm Control the flow of vital O2 from :your pond aerator or aquarium air pump with this handy Manifold Taps Valve.