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Daystar firewall boots are sweet little solutions to leaky rubber grommets. Run hoses or air lines, or wire your stereo or gauges--the applications are unlimited! There are no sharp edges to cause chaffing or shorts. And, your project is sealed from the elements, too. These boots are the perfect, leak-free way to plumb wires through bulkheads, firewalls, and more. Daystar universal-fit boots are also heat-resistant and can handle thicknesses and/or bundles from 3/8 in. to 1 in. You install them, run your wire, trim the boots to size, and secure them with a zip tie--safe, simple, and cleanly done!