Ideal for handling oil-based liquids.Wet-end components are cast-iron,steel, Hilite-55(Cellulose), and Viton. Nos. Sug91 to Sug96 have wet-end components of steel, cast-iron, Hilite-55(cellulose) and Teflon. Steel spur gears. Zerk model use Teflon and nonZerk model use Viton lip seal.