... High Efficiency Oil Removal Filter : Product introduction:Grades:totally 5 grades as HF9,HF7,HF5,HF3,HF1.Max.working pressure ... effective surface area_improves capture rate-ensures high efficiencies,Large open area minimizes pressure dropCoated,closed cell form sleeve: ... Set,Industry using Water Cooler,HF series High-efficient precision-filter (home made filter housing, Hankison element)etc.Totally 13 ...