Sufficient quantity: The package contains 30 black fish tank air pump control valves, which are sufficient to meet your and replacement Two-way control valve: There are two-way control valve for aquarium air pump, no need to find the direction, easy to install, just plug directly into the 4mm trachea. material: The fish tank T-shaped control valve is made of plastic, which is light, , and . The water is safe and reliable, so you can use it with confidence Wide range of applications: The fish tank air pump valve can be used in household fish tanks, landscape scene aquariums, restaurant ornamental fish tanks or other drip irrigation systems; it can be rotated to control the air or water flow, and the switching is simple and convenient Size information: The length of the fish tank air hose valve is approximately. 38 mm / 1.5 inches, suitable for connectors with a diameter of 4 mm / 0.16 inches Material:plastic colour:Black Package Contents: 30 x Air pump control valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.