Anderson Metal 38310-0840 Brass Pipe Nipple, 1/2" x 4"Highlights: Male pipe threads Polybagged 36 & 56 numbers are yellow brass 38 numbers are red brass Chrome Plated Pipe Nipple Pipe fitting used to connect brass, copper & iron pipe 1 2" x 4" WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www. P65Warnings. ca. gov