BrassCraft CSSC21-12 ProCoated Stainless Steel Gas Connector, 3/4-Inch F.I.P. by 3/4-Inch M.I.P. 1/2-Inch I.D. (5/8-Inch O.D.) 15/16-16 thread Coated gas appliance connector Made from 80-85 percent recycled materials The brass bar stock comes from 100 Percent recycled material Stainless steel