Uxcell Aquarium Dual Line 18-Way Air Pump Control Valve Manifold Taps Aquarium Air Valve; Material : Metal Color : Silver Tone; Design : Dual Line 18 Way Outlet Fit Tube Dia.(Outlet) : 4mm/0.16";Fit Tube Dia.(Inlet) : 18.5mm/0.73" Overall Size : 21 x 6 x 2.3 cm/8.3" x 2.4" x 1" (L*W*H);Net Weight : 294g 1 x Aquarium Air Valve