... caseCertificate: ISO 9001:2008,CE,TUVConnection type: weld/weld,clamp/clamp,male/male,weld/clamp,weld/male,clamp/maleOperation: 1) Manual, 2/3/4-position pulling handle ... double-action(air open/air close).Compact appearance, small volume, large torque, small and convenient assembly. 3) Electric: With on-off ...