Air Valve - SODIAL(R) 10 Pieces Plastic Aquarium Fish Tank 2 Way Air Pump Control Valves, Blue Product Name : Aquarium Air Valve Material : Hard Plastic; Color : Blue Connector Diameter (Each) : 4 mm/ 0.16" Thread Diameter : 9mm/0.35" Total Size : 3.7 x 2.4 x 0.9cm / 1.4" x 0.96" x 0.35" (L*W*T)