Видео с ютуба Duct Jack

Lifting AC unit using a Sumner Duct jack

183 TOOL OF THE WEEK DUCT JACK

P Stevick duct jack operation 8/23/18

Джек и Лондон - S01E12 (Duct Tape Gagged) [Ukraine]

Transformer with bus-duct repositioning through jack..

LiftSmart Material Lifts - Service Video / Replacing a broken cable inside the telescopic mast.