uxcell Plastic Aquarium Fish Tank Connector 2 Way Air Flow Control Valve 10 Pcs Black It is made out of plastic material in gray, 2-way design Aquarium Air control Valve. The Aquaculture Air Valve can be connected to aquarium tubing. Weight : 17.5g;Color : Black;Material : Plastic Product Name : Aquarium Air Valve;Hose Connector Diameter : 5mm/ 0.2" Package : 10 x Aquarium Air Valve;Total Size : 4 x 2.5cm/ 1.6" x 1" (L*W)