Product name : air flow control valve; fit for : Aquarium, Fish Tank Outlet Dia: 4mm/0.16"; Fit Air Tube Dia: 4*6mm/0.16"x0.24"; Inlet Dia: 8mm/0.31"; Fit Water Tube Dia: 8*10mm/0.31"x 0.39" Air Valve Overall Size: 43 x 53 x 21mm/1.7" x 2.1" x 0.8"(L*W*H) Control the flow of vital O2 from your pond aerator or aquarium air pump with this handy Air Control Valve,Used for aquarium and aquaculture applications. Air lever valve can be connected to aquarium tubing aquarium air valve control air water flow lever valve is the best choice for fish tank and aquaculture applications. Package Content : 2 x Aquarium Air Valve, Air pump aquarium control air water flow lever valve is the best choice for fish tank and aquaculture applications. Lever valve let you operate it easily. This lever valve can be used for aquarium, hatchery and aquaculture applications.