The Royal Filter RL Series element is designed for efficient removal of particulates from liquids or gases when nominal filtration is required. The RL Series elements are constructed of the finest quality materials. The media is phenolic, resin impregnated cellulose, heat cured for strength and durability. Tin plated steel outer body and endcaps, 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. The RL Series offers quality and performance at an economical price.