A PASS device (Personal Alert Safety System) also known as a distress signal unit (DSU) or ADSU (Automatic Distress Signal Unit), is a personal safety device used primarily by firefighters entering a
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PL series liquid ring vacuum pump from PPI generates 700mm of Hg(G) Vacuum with suction capacity 550 to 15000M3/Hr, consuming 90kW to 600kW power.
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