ST21020 Spin-On Fuel Water Separator for FS36210 612630080203

The ST21020 is a spin-on fuel/water separator designed to help remove water and particulate contaminants from diesel fuel before the fuel reaches sensitive injection-system components.

The lower drain structure allows collected water and contaminants to be discharged during routine maintenance. This product is supplied as the spin-on filter element shown in the product image; the filter head and mounting base are not included.

Before ordering, compare the existing filter number, mounting thread, outer diameter, overall height, sealing surface and lower drain structure. A matching cross-reference number alone should not replace a physical specification check, especially when another filter has a different overall height or lower-end configuration.