This 1/4 in. swivel nut and barb stainless flare fitting set is perfect for anyone working on plumbing or fluid - transfer projects. Whether you're a DIY enthusiast or a professional plumber, it's a must - have. Use it when connecting pipes or tubing in your home plumbing system or in industrial setups. The 1/4 in. size of the barb and swivel nut is ideal for standard connections, and for a snug fit, go for the 3/16' ID tubing.