The Royal Filter RL Series element is designed for efficient removal of particulates from liquids or gases when nominal filtration is required. RL Series elements are constructed of the finest quality materials. Media is phenolic resin impregnated paper, heat cured for strength and durability. Plated steel components, thermosetting PVC adhesives, and Buna N gaskets are standard on RL Series elements. Center cores are spiral formed, electroplated steel to prevent cartridge collapse at high differential pressures. External outer bodies are perforated, tin plated steel. The RL Series offers quality and performance at an economical price.