The perfect fuel filter for oil fired heating appliances used in small to average sized homes and commercial buildings. It is ideal for final filtration in central fuel oil distribution systems. Working pressure 12 P.S.I. 3/8" NPT. 10 Micron. Wool felt cartridge, center core bonded to prevent media migration. 3 gaskets included. UL listed. Replacement cartridge for filter model No. 2A-700A, 25 GPH firing rate. 10 micron wool felt, center core bonded to prevent media migration, may also fit Unifilter model No. 99, Sid Harvey model No. XF-1/265, Autoflo model No. F-400, and Eddington model No. S-252. Replacement cartridge for filter model No. 1A-25A. 10 GPH firing rate. 10 micron wool felt, center core bonded to prevent media migration, may also fit Unifilter model No. 77, Sears model No. 8055, Sid Harvey model No. XF-25/264, Autoflo model No. F-300, Eddington model No. S-254, and Federal model No. A-77.