SPD fuel filter element compact 100 micron This insert filter is suitable where the fuel filter is used as a pre-filter. SPD filter insert of 100 microns. Fits SPD fuel filter. We recommend changing this filter insert every season as a preventative measure to always be able to trust your fuel pressure to 100%. The insert filter is completely made of stainless material. The insert filter also has a magnetic ring where the fuel enters to collect even the smallest metal particles that can come from fuel pumps, tanks, etc. All to protect the spreaders. All SPD products maintain the absolute highest quality and are carefully tested to ensure they work in the most demanding motorsport.