A-FF5206 Filter, Fuel, Spin-On (QTY 12)Fits Case of 12 Aftermarket Replacement Fuel Filters, Spin On Fleetguard FF5206 This listing is for a Fits Case of 12 spin on fuel filters replacing Fleetguard FF5206. These 20 micron spin on fuel filters are designed to remove dirt, dust, and other contaminants from diesel fuel systems, helping to protect injectors and extend engine life. Commonly used on Detroit Diesel engines and medium duty diesel applications, the FF5206 threads onto standard