Sscon 3/16 Inch Aquarium Air Pump Check Valves Plastic One Way Non-Return Check Valve, Pack Of 20, Black Color

Product Specifications: Color: Clear Black Material: Polystyrene(PS) Length Size: 54mm / 2.13-inch Max.Diameter Size: 14mm / 0.55-inch Air Hole Inner Diameter: 3mm / 0.12-inch Air Hole Outer Diameter: 5mm / 0.2-inch Package Content: 20 x Plastic Check Valve Non-Retur