TOOGOO(R) 5 Pcs Fish Tank Gray Plastic Connect 3 Tubes Cross Air Control Valves Splitter Product Name : Aquarium Cross Air Valve;Material : Plastic Color : Gray;Port Diameter : 4mm (Inner Dia.), 5.3mm / 0.2"(OD) Thread Diameter : 9.3mm / 0.36";Total Size : 37 x 41 x 12mm / 1.5" x 1.6" x 0.5" (L*W*T) Weight : 11g Package Content : 5 x Aquarium Cross Air Valve