want a kind of professional Fish Tank Oxygen Pump Control-valve? want to control the oxygen in your fish tank? This oxygen pump control-valve be your . Really practical and useful, suitable for fish tank and aquarium. Aquarium oxygenation pump tube control-valve can control size. Suitable for repairing or extending oxygenating pump hose. Features -Color:Blue -Material:Plastic - Size: 3.80X2.00X0.80cm/1.49X0.79X0.31in -The pump control-valve is very , anti-rust, thus you can use it with confidence. -With this item, you can control the oxygen in the fish tank more easily, which will keep your fish in an activated condition. -Fine workmanship and , you can use this item for a long time in your daily life. -Made of good , ensure its durability and practicability. You can use it for a long time. -This is a great air oxygen control-valve for fish tank, and can be replaced if this valve is broken. Package list: 30 x air valves