General Filters Oil Filter, 10u Micron, 4-3/8 in Diameter, 6-1/4 in Length, 25 gph, 40 psi, 3/8 in Connection, NPT Connection, Wool Felt Media, For Final Filtration In Central Fuel Oil Distribution Systems. This product can be used in small to average sized homes and commercial buildings. It works effectively and is convenient to use as well. It is definitely a great quality product.