The Permatex Gasket Sealant Form-A-Gasket is a high-quality anaerobic gasket maker that seals flanges and fittings. It is formulated to provide resistance to ATF, coolant, oil, and other shop fluids. This gray liquid gasket maker cures when confined in the absence of air between close fitting metal surfaces. It resists aging, weathering, vibration, moisture, fuels, and shop fluids. The product comes in a 2 oz tube, has a temperature range of -65F to 300F when cured, and offers high temperature resistance. It is designed for use on rigid machined flanges with less than .001-inch gap.