The Waterline PEX Barb Fitting is an easy to install, low cost solution to connect PEX Tubing. Waterline PEX Barb fittings are compatible for potable water distribution and hydronic heating applications. These PEX fittings may be used with the stainless steel clamping system or the copper crimp ring system (both sold separately). The Waterline PEX Barb fitting range offers a wide variety of fittings, manifolds, valves, clamp rings, crimp rings and tools in various sizes to help complete your next plumbing project.