uxcell 5 Pcs Clear Black Air Pump Plastic One Way Check Valves for Aquarium Fish Tank Product Name : Aquarium Check Valve;Use for : Fish Tank, Aquarium Fit for Hose Diameter : 5mm / 0.2";Overall Size : 41 x 13mm/ 1.6" x 0.5"(L*Max.D) Material : Plastic;Color : Green, Clear Weight : 11g Package Content : 5 x Aquarium Check Valve