Uxcell 5-Piece Plastic Fish Tank 2-Way Air Flow Control Valve Set Aquarium Air Valve Material: Hard Plastic; Color: White; Total Size: 4.7 x 2.5cm/1.8" x 1" (L*W); Weight: 10.3g Thread Diameter: 9mm/0.35" Connector Diameter (Each): 3mm/0.1" Package Content: 5 x Aquarium Air Valve