DescriptionThis is a 4mm inline tubing connector. It is made of good quality plastic material, mini, lightweight and durable to use. It can be used to control air volume or water volume, perfect for fish tank and aquarium.Features-Color: Black-Material: Plastic -Size: 4.00X2.00X1.00cm/ 1.57X0.79X0.39in - Made of good quality material for lasting use.- T-type gas regulating valve, which can adjust the air volume arbitrarily- Specially designed and adjusted outlet valve for one pump with multiple fish tanks- Simple installation and easy to use, simple and neat shape.- Connect with air pump and air stone, you can adjust volume to generate different sizes of bubbles.