The R12T power element serves a critical purpose in numerous diesel systems, acting as a sophisticated water-oil divider . It reliably filters out contaminants , specifically water and unwanted oil , https://ifjf.net/products/ifjf-r12t-fuel-filter-water-separator-120at-npt-zg1-4-19-automotive-parts-complete-combo-filter-fit-diesel-engineinclude-four-fittings