uxcell Aquarium Metal 2 Way 3.3mm Inner Dia Air Line Tubing Flow Control Valve 4pcs Package Content: 4 Pcs x Aquarium Control Valve; Total Size: 30 x 22 x8mm/1.2" x 0.8" x 0.31"(L*W*T) Color: Silver Tone; Material: Metal Product Name: Aquarium Control Valve; Net Weight: 28g Inside Diameter 3.3mm Connector Outer Dia (Approx.): 5mm/0.19"