Pentek RFC-93 # 155063 RFC93 Radial Flow Whole House GAC Carbon Whole House Water Filter Cartridge Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. Radial Flow Granular Activated Carbon 20 Micron Water Filter. 9 3/4" long X 2 1/2" diameter. 24 per case, sold individually. Ametek # 155063. RFC Series cartridges are constructed with a porous polypropylene outer shell and durable polypropylene end caps. Sandwiched between the outer shell and the core is a bed of granular activated carbon. The unique radial flow design offers the benefit of granular activated carbon filtration, such as low pressure drop, while at the same time eliminating the release of carbon fines commonly associated with GAC style cartridges. RFC Series cartridges are ideal for point-of-entry POE, whole house filters and other high flow rate applications. Order a case and save even more.