Brass Inverted Flare Fittings offer a metal-to-metal seal that is internal to the fitting for tighter tube bends. These fittings are well adapted for high pressure service and have exceptional resistance to mechanical pull out. Inverted flare brass fittings are a type of plumbing fitting that is used in a variety of applications. Inverted flare brass fittings get their name from their inverted (flared) shape. These Brass Inverted Flare Fittings are commonly used to connect two pieces of pipe or tubing together.