Jardin Non-Return Plastic Air Pump 2-Piece Check Valves for Aquarium, Red/Clear Product Name : Check Valve; Use for : Fish Tank, Aquarium Hole Diameter : 1.8mm/0.07"; Total Size : 5.3 x 1.5cm/2.08" x 0.59"(L x D) Material : Plastic; Color : Clear, Pink Weight : 9.0g Package Content : 2 Pcs x Aquarium Check Valve