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Specification: Material: plastic Color: black & red Quantity: 16pcs Size: Air Hole Diameter: 5mm/ 0.19inch Overall Size: 5 x 1.5cm/ 1.9 x 0.6inch(LxD) Note: Please DO NOT use them with CO2 system. Please check if install correctly. One check valve is required for each outlet, and two for double-head pumps, and so on. Please use a paperclip to poke it from Input side to Ouput side when the outlet inside gets stuck. Before installation,you may need to unscrew and open up check valve, pinch the rubber boot inside valve to make sure small slit is open. Otherwise no air to tank. Package includes: 16pcs x Aquarium Check Valves