High vacuum without water or oil sealing Hibon air injection positive displacement blower package “VP” are the only dry blowers capable of attaining 28" Hg vacuum/93% vacuum. They are self-cooling, requiring no vacuum relief valve and are designed for continuous industrial use 24 hours a day. The self-cooling design enables warm gases handling and eliminates or reduces the need for pre-cooling. Theses blowers are very efficient for vacuuming a large variety of products, wet or dry.