Jardin 5-Piece Plastic Non-Return Aquarium Air Pump Check Valves Product Name: Aquarium Check Valve; Use for: Fish Tank, Aquarium Tip Outside Diameter: 5mm; Total Size: 3.4 x 1.8cm/1.3 x 0.7"(L x D) Material: Plastic; Color: Blue Weight: 10g Package Content: 5pcs x Aquarium Check Valve