Unused 500 gpm vertical filter manufactured by Houston Process & Design. 17" diameter x 73" height. Carbon steel shell with 316L stainless steel internals, dished quick-opening top and leg supports. Rated 220 PSIG/FV @ 160°F. Serial #1665-1. National Board #833. Tag #18-FD-1861. Built in 2023. Previously designated as RJFU-B Startup Oil Filter.