Rusco / Vu-Flow 1" Spin Down filter cartridge with 500 mesh polyester. This polyester filter replacement element for 3/4" and 1" filter systems is manufactured by Rusco /Vu-Flow. This is Vu-Flow part number is NT30-SC500, or Rusco part number is FS-1-RE-500. This filter element is manufactured for use with both Vu-Flow 1" and 3/4" T-Style filter systems and Rusco 1" and 3/4" Spin-Down Sediment filter systems. Vu-Flow and Rusco are the same manufacturer, out of the same location in Brooksville, Florida. The screen shipped may have either the Vu-Flow or Rusco branding as both are identical. The re-usable filter element screen measures 5½" x 1-3/16".