Ideal for collecting solids in typical one-pass applications, Freedom Plastics offers Cartridge Filtration Systems for industry standard 20", 30" and 40" size cartridges. Constructed of PVC, CPVC or polypropylene thermoplastic materials, the units won't corrode inside or out. Each unit is equipped with a cartridge assembly containing five standard open-end 20 micron-rated filter tubes. Rated for 100 psi max. operating pressure, the units come standard with 2" NPT connections and are available in various connection sizes in NPT, Flanged, Spigot or Victaulic groove. Freedom Plastics. Circle 11.