This is a Supply Giant reducing elbow with sweat sockets on both its ends. The fitting, which has a rolled tube stop, is made of copper and meets all applicable standards. It is designed for use with copper pipes having a nominal diameter of 1-1/4" and 1", and an outer diameter of 3/8" and 1-1/8". ⚠ 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.