This is an Supply Giant nipple fitting with male threaded ends, which is made of steel with a black coating for improved durability of the Part. The nipple is 3 inch long and has a 3 inch nominal pipe size diameter, with a wall thickness being specified as Schedule 40. The fitting meets all applicable ansi and ASTM standards. ⚠ 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.