Time to change the filter in your Racor fuel/water separator? This is the genuine R45T replacement element. It's a 10-micron filter, which is great for catching fine contaminants in diesel or gasoline fuel systems to protect your engine's injectors and pumps. It features Racor's Aquabloc technology, which helps coalesce and separate water from the fuel. This element fits Racor series 345 and 445 filter housings (like the popular Racor 500FG and others). Always a good idea to change these filters according to your maintenance schedule to ensure clean fuel and prevent costly engine damage. It's a straightforward swap: drain the bowl, unscrew the old filter, lubricate the new O-ring (if needed), and install this one. A crucial maintenance item for any boat, generator, tractor, or diesel truck equipped with a Racor filter. Keep your fuel clean and your engine running smoothly.