Matco-Norca’s grooved couplings come painted or galvanized in sizes 1 to 12 inches. They have a ductile iron body (ASTM A536), feature EPDM gaskets and are UL/FM approved. Schedule 40 grooved nipples are available in either grooved by beveled or grooved by threaded configurations and conform to ASTM A53 and ASME B1.20.1 standards. All grooves are cut per the American Water Works Association C606 standard. Grooved nipples come in sizes 2-by-4-inch, 3-by-3-inch and 3-by-4-inch. 800-431-2082; www.matco-norca.com.