This is a lead free Supply Giant drain coupling with sweat sockets on both its ends. The fitting, with a cap, is made of cast brass and meets all applicable standards. It is designed for use with copper pipes having a nominal diameter of 1/2 inch . ⚠ 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.