We have two (2) nano bubble generators for sale. They have been used but are in like new condition. $50 each OBO. Model/Make: Yixing Holly Technology Co. Ltd., China Bubble Dia.: 80 nm-20 µm Spec: 1.1 KW, 220 V/380V, 24A, 60Hz Capacity: 240 m3/d $25 each OBO. Items are sold as is. No returns, no refunds, no warranties.