20 Pcs Aquarium Tank Air Pump Plastic One Way Check Valves Product Name : Check Valve;Use for : Fish Tank, Aquarium Air Hole Diameter : 1.5mm/0.059";Overall Size : 5 x 1.5cm/1.96" x 0.59"(L*Max.D) Material : Plastic;Color : As Picture Shown Net Weight : 74g Package Content : 20 Pcs x Aquarium Check Valve