Greatech Fine Bubble Diffuser Diameter: 220 to 330mm Flow: 0.02 - 0.14 m3/ min Single Membrane, Dual Membrane, Pipe Fitting are also available. Best regards, Susan Huang / Sales Executive Greatech Machinery Industrial Co., Ltd. E-mail: susan.greatech@ gmail.com Web: www.greatech-rootsblower.com Tel: + 886 6 2536997 Fax: + 886 6 2533092