Water & Wood Aquarium Fish Tank Air Flow Control Lever Pump Single Way Valve, 4-Piece Product name : air flow control valve; fit for : aquarium, fish tank Material: stainless steel;outlet hole diameter: 3 2mm/0 126" Thread Diameter: 5. 2mm/0. 2";Size: 2. 1 x 2. 4 x 0. 8cm /0. 83" x 0. 94" x 0. 31"(L*W*T) Color : Silver Tone;Weight : 28g Package content : 4 x air flow control valve