A flare nut is used to secure the flared tubing's tapered end to the also tapered fitting, producing a pressure-resistant, leak-tight seal.
![Brass Forged Flare Nut 1/2" (10/Pkg.) Brass Forged Flare Nut 1/2" (10/Pkg.)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/324171/463118/200083_01__36121.1678479782.jpg?c=2)
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A flare nut is used to secure the flared tubing's tapered end to the also tapered fitting, producing a pressure-resistant, leak-tight seal.