Epoxy coated galvanized steel inside and out. Fuel oil filter for average size and for large size homes and commercial applications, one or two pipe systems. “Step design” filtration removes moisture, solids, and other impurities. UL listed for No. 2 fuel oil. Working pressure 40 PSI. Firing rate 25 GPH. 3/8" NPT. Features the 4EVERLoc Bottom Bold Design. Comes standard with BioGasket™. Compatible with fuel oil blends through B100.