The Model FD-1500 Filter Dryer filters and de-hydrates supply gas for Flexflo™ Pilots. The FD-1500 Filter-Dryer provides superior filtration and dehydration with 110 square inches of 10 micron filtering media and 2.0 pounds of silica gel. The FD-1500 incorporates an easy-to-replace “spin on” cartridge made up of a high quality, high capacity nylon and fiberglass filter element reinforced with stainless steel mesh. All FD-1500's are fully Hydrotest to 2.5 times the working pressure to ensure the integrity of the pressure vessel.