uxcell 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