The Pack Of 5 NIBCO PC604P Adapter is a set of high-quality fittings designed for plumbing applications. Made in the United States, these 3/4" PEX x 3/4" press copper fittings are ideal for connecting various plumbing components. With a California Prop 65 Warning for safety, these units are reliable and durable for both commercial and residential use. Perfect for professionals in the plumbing industry or for DIY enthusiasts, this pack of NIBCO adapters offers a convenient solution for a range of plumbing projects.