Boat owners and mechanics, this Osculati replacement cartridge is exactly what you need for your Racor 500MA fuel filter system! The part number 17.667.21 ensures it's the correct fit for your specific Racor filter setup. Regular filter changes are crucial for keeping your engine running smoothly and preventing fuel system issues, and this genuine replacement cartridge delivers the quality you need. The construction is designed to meet Racor's specifications for proper filtration and flow rates. Whether you're maintaining a commercial vessel, pleasure boat, or industrial equipment with a Racor 500MA filter, this cartridge will keep your fuel clean and your engine protected. The installation is straightforward if you're familiar with Racor systems - just make sure to prime the system properly after changing. Don't risk engine damage with cheap imitation filters - this Osculati cartridge is made to the same standards as the original. Keep a couple on hand so you're always ready for your next scheduled maintenance interval. Your engine will thank you for using quality filtration!