Available in 4-40, 5/8, ¾, 7/8, and 1 in. sizes, BarTite High Strength Sealing Washers seal out moisture, vapors, liquids, chemicals, pressurized air, and other contaminants. Units employ stable, non-aging plastisol sealant that is resistant to wide range of liquids. Impervious 360° seal is achieved by applying torque, which sends plastisol sealant flowing out in every direction and down into threads, filling all potential leak paths.