TOOGOO(R) Single Way Aquarium Control Air Water Flow Lever Valve Control the flow of vital O2 from your pond aerator or aquarium air pump with this handy Air Control Valve. Nickel-plated lever Single Way Aquarium Valve can be used for aquarium and aquaculture applications. Lever valve let you operate it easily; With the nickel-plated material. The outlet of Water Flow Control Valve can be connected to aquarium tubing; Branch outlet valve: 3.1mm(diameter) Outlet diameter: 3.1mm; Weight: 8.3g; Package content:1 x Aquarium Lever Valve