Collection: Auto - Inverted Flare Fitting

Ensure leak-proof performance in your vehicle’s high-pressure fluid systems with our selection of Auto Inverted Flare Fitting components. At DIY Customs, we provide high-durability brass and steel inverted flare nuts, specialized unions for brake and fuel lines, durable adapters, and heavy-duty tee fittings designed for a perfect fit. Whether you are plumbing a custom brake system for a performance build, repairing corroded fuel lines, or outfitting a classic restoration with period-correct hardware, our professional-grade fittings offer the seal integrity and vibration resistance you need at unbeatable prices. From specialized long-reach nuts and metric-to-standard adapters to armored line protectors and complete fitting assortments, we carry the essential gear for every fluid system. Don't see the specific thread size (3/16", 1/4", 5/16"), tube diameter, or specialized coating for your plumbing project? Hit the live chat or call 412-882-8346—we can special order and drop-ship exactly what you are looking for directly to your doorstep!