Features: Specially designed non-return valves will protect you air pump by preventing aquarium water from back siphoning during a power outage. Specification: Weight:46g Material:Acrylic,Plastic Color:Clear,Black Outlet Diameter:4mm/0.16" Total Size:63 x 58 x 105mm/2.48" x 2.28" x 4.13"(L*W*H) Package Includes: 1 x Aquarium Air Check Valve Note: Due to the manual measurement,there may be small deviations. The color may have different as the difference display,please understand. 🐠Product Name: 3-Way Aquarium Air Check Valve. 🐠Outlet Diameter: 4mm/0.16". 🐠Total Size: 63 x 58 x 105mm/2.48" x 2.28" x 4.13"(L*W*H). 🐠3 outlet plastic multiple air Flow valve with controlled lever. 🐠Made of high-grade acrylic and plastic material, non-toxic and durable.