(Image/Classic Tube’s YouTube Channel)

Flare fittings are often used in high pressure plumbing applications, where sealing and reliability are critical. So it’s probably no surprise that flare fittings are common in vehicle brake and fuel systems.

Yet any fitting obviously needs to be installed correctly to offer a proper seal, and that’s especially true for flare fittings, where burrs, deformed flare edges, and overtightening can easily introduce leaks.

That’s why the tube tutors over at Classic Tube made this video to show you the importance of inspecting the flare fitting’s seats (mating surfaces) before grabbing your flare nut wrenches.

It’s less than two minutes long and a must-watch for anyone installing flare fittings. Check it out below.

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