uxcell 5-Piece Plastic Fish Tank Pump Air Valves Tube Connectors, 4mm 2-way design Aquarium Air control Valve; Simple design for easy use; T Product Name : Aquarium Air Valve; Material : Plastic Color : White; Port Diameter : 2mm/0.078"(Inner Dia.), 4mm/0.16"(OD) Thread Diameter : 9mm/0.35"; Total Size : 43 x 23 x 12mm/1.7" x 0.9" x 0.47"(L*W*T) Weight : 10g