2-Piece Fish Tank Aquarium Plastic Air Pump Check Valves, Clear/Pink Product Name: Check Valve; Use for: Fish Tank, Aquarium Hole Diameter: 1.7mm/ 0.06";Total Size: 5.3 x 1.4cm/ 2.08" x 0.55"(LMax.D) Material: Plastic; Color: Clear, Pink Weight: 9 Gram Package Content: 2 Pcs x Aquarium Check Valve