Uxcell 5-Piece Plastic Aquarium Pump Air Valves Tube Connector, 4mm, White 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"(LxWxT) Weight : 10g Package Content : 5 x Aquarium Air Valve