JEGS premium line of RTV ''gasket maker'' compounds are designed to be oxygen sensor safe and meet a multitude of needs. Resistant to the chemicals found in oil, water, anti-freeze and transmission fluid. Can be used to form a gasket or as a sealant on pre-made gaskets to increase dependability. Each tube includes an adjustable applicator tip for control while drawing various size beads. Made in USA.Tech Tip: When using silicone do not always reach for the "blue". Pick a color that matches your engine parts, such as grey for installing cast aluminum components. You will also gain the added benefit of a higher temperature rated material. So it may pay in the long run to color coordinate.