Chrome-plated stop valve adapter, 1/4" SB (SharkBite) x 3/8" OD (outside diameter) compression. The fitting can be used with copper, CTS (copper tube size), PEX (cross-linked polyethylene), and CPVC (chlorinated polyvinyl chloride), and is rated at 200 F, 200 psi (pounds per square inch). It is made of 1-piece DZR (dezincification- ) brass. Fittings can be buried and placed behind drywall. Fittings are removable and reusable. Product is individually bagged. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Chromium (hexavalent compounds)