PEX Barb x Female Iron Pipe Adapter is an easy to install, low cost solution to connect PEX Tubing. This PEX Barb fittings are compatible for potable water distribution and hydronic heating applications. PEX fittings used with the stainless steel clamping system or the copper crimp ring system. The brass adapter is made of lead-free and features a PEX x female iron pipe end connection. This fitting provides a means of adapting a threaded connection to a PEX connection. ⚠ California Proposition 65 Warning: This product is known to the state of California to cause cancer, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.