... 2 perfect separation effect 3 wide application 4 easy operation NG type sludge thickener 1 use and characteristics:the thickener is ... drive,S-manual rake(rake automatically without the s)(2)NG-18 model N-thickner,G-peripheral roller transmission,18-thickner ... diameter(m)(3)NT-18 model N-thickner ,T-peripheral ragk transmission,18-thickner ...