General Filters 9012 Replacement Cartridge, For Use With 77B, 1A-25B, 1A-25A Fuel Oil Filters, Microfiber

Constructed from spun fiber. Designed to filter oil in a heating application. For FUL-FLO FB-4 filtration system. Boiler replacement part, complete with gaskets. Gear-tooth design. Compatible with fuel oil conforming to ASTM D396-09 (up to B5). RF-1 micRoFiber Replacement Cartridges - for 77B, 1A-25B, 1A-25A.