uxcell Rubber Fish Tank Air Curtain Bubble Diffuser, 75cm, Black Aquarium Air Curtain Bubble; Material : Rubber Pipe Diameter(Approx.) : 1cm/0.4";Pipe Length : 75cm/30" Inlet Connector Inner Dia. : 2mm/0.08";Inlet Connector Outside Dia. : 4mm/0.16" Color : Black; Net Weight : 102g 1 x Air Curtain Bubble