Metallic & Loose Particle Elimination The Taco 4900 Series ® Magnetic Dirt Separator increase system life and efficiency by removing ferrous material and other harmful, loose particles from closed loop hydronic heating systems. A powerful, service-free magnetic ring and convenient blow down valve are included for quick and easy system maintenance. The 4900 Series ® Magnetic Dirt Separator is available with Sweat or NPT connections in sizes ranging from 3/4” – 2”. Longer system life, better performance!