... Anti-rust treatment 4. New testing equipment centrifugal pump ◊ ApplicationApplied to pumping such liquid which is clean, no solid matter or frictional matter ... ventilatedINSULATION Class B/FPROTECTION IP44/54The normal power standard is 220V/50HZ single phase.three phase 220/380V/50HZ, 220/440V ... /60HZ,single phase 230V,240V,127V, 110V,115V/60HZmodel series available ...