uxcell Water Air Flow Control Valve for Aquarium Fish Tank 3mm Tube Dia 2pcs Color: Silver Tone; Package Content: 2 x Aquarium Air Valve Total Size: 30 x 21 x 8mm/1.2" x 0.8" x 0.3"(L*W*T); Material: Metal Product Name: Aquarium Air Valve; Net Weight: 16g Design: Double Way Outlet Fit Air Tube: 3mm/0.12"