The FST Performance is a replacement spin-on filter for RPM500. This is an easily replaceable filter element which is totally self-contained, requires no messy and questionable canister cleaning, eliminates cartridge style filter back flushing and totally eliminates any chance of fuel system contamination. In the filter sealing system there are no housing seals or gaskets to dig out and no gaskets, o-rings or seals to leak or swell. The unique flow pattern increases filtration efficiency and provides the maximum flow and the heart of the FloMax system. Patented filter flows 300 gallons per hour down to 3 microns with a total of 579 square inches of filter media and water capture reservoir..