Uxcell 2-Piece Plastic Housing Aquarium Non Return Air Pump Check Valves, Clear Check Valve; Use for : Fish Tank, Aquarium Air Hole Dia(Each) : 1.9mm/0.07";Overall Size : 5.3 x 1.5cm/2.1" x 0.58"(L*Max.D) Material : Plastic; Color : Clear, Pink Net Weight : 9g Package Content : 2 Pcs x Aquarium Check Valve