... Pump 2:Caliber:10mm,15mm,25mm,40mm,50mm,65mm,80mm,100mm 3:Material:Cast Iron/E.Plastic/Al/ST QBY air operated ... diaphragm pumps is the third generation of pneumatic diaphragm pump,with the trait of long ... some uneasy flowed medium,with the merits of self-pumping pump,diving pump,shield pump,slurry pump and impurity pump,etc. QBK-65 Pneumatic Diaphragm ...