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Improve the look of your wiring with Fastronix. Professionally route your wiring to your engine compartment with weather tight grommets. These wire grommets feature a special nut that locks down on the wire to prevent movement and create a weatherproof seal. To achieve a waterproof connection, use with only 1 wire. Stop Struggling with Traditional Rubber Grommets that Fall Out and Look Cheap. Internal TPE gasket is resistant to gasoline, alcohol, oil, grease, and common solvents. Great for automotive, marine, off road, and recreational vehicle applications. Simply install the grommet in a 1-29/64" hole using the backing nut, feed your wires through the grommet, and tighten the outside nut to keep your wires in place.