... shaft. with thermal protector inside. singal phase 220v/50hz. brass impeller, carbon steel motor shaft. with thermal protector inside. ... and air transportation is extremely convenient. Company manufactured "Jusen" brand series pumps, which is based on unique - designed, new style, ... certification" , and approved by ISO9001, and ISO2000 SWP series jet pump,self-priming pump ,centrifugal pump,water pump