... in order to meet the demands of diving operations, salvage, fishing, aquaculture, sediments salvage underwater engineering, water parks, shipbuilding ... apparatus cylinders used by divers.III.Product Features:Fully automatic unloading system, less starting current compared with high power ... 30Mpa Scuba Diving Air Compressor for Diving Operations,Salvage,Fishing,Aquaculture,Sediments Salvage Underwater