1/2" Red Brass Union. It is a Lead-Free compliant product which meets Public Law 111-380. It has a pressure rating of 200 psi and an operating temperature of 150 degree F. It is approved by California AB 1953, Federal Government S.3874, Federal Public Law 111-380, Louisiana Act #362, Maryland HB-372, Vermont Statute, Title 9, Chapter 63 : 247h.
WARNING: This product can expose you to lead, a chemical known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov