11 Filter housings, filter bags, filter cartridges, filter baskets, and filter elements, all for the handling, treatment, and processing of liquids and fluids in industrial, commercial, and environmental uses; gas and liquid separators, coalescers, exhaust heads, drains, traps all for the handling treatment and processing of air, gas, and steam in industrial, commercial, and environmental uses; pipeline strainers, namely, simplex and duplex basket strainers, automatic self-cleaning strainers, temporary type strainers, Y type strainers, T type strainers, strainer baskets, strainer screens, strainer elements, all for the processing of liquids and fluids in industrial, commercial, and environmental uses; industrial liquid filters, namely, filter bags for use in pressurized filter vessels; filter element assemblies for use in equipment for treatment of industrial liquid streams; filtration systems, namely, pressure vessels, filter bags, filter media, filter bag restrainers, and pumps therefor; filter bag rings used as components of filters for use in sealing pressure vessels used in filtering industrial liquid streams; industrial fluid and gas processing, treatment and handling units, consisting of separators, traps, flash tanks, vents, drainers, exhaust heads, extractors, and purifiers; industrial filters and holders therefor for liquids and gases; strainers for industrial, environmental and processing use made primarily of metal