Fuel Filter (FF1232) by Hastings. Fuel Element with Bail Handle. Emergency By-Pass Tab. Inner Diameter: 5/8" & 7/8". Outer Diameter: 4-5/16". Length: 3-29/32". Dirty fuel is a fact of life. Even with the development of cleaner-burning fuels, contaminants are still a major concern when it comes to fuel systems. This filter is designed to protect fuel system components, such as injection pumps and injectors, from damaging contaminants, including water, bacteria, non-combustible materials, wax, and tar-like contaminants. It's pressure tested to ensure long-lasting and reliable operation.