Sold as each. 4500 W, 240V. For Polymer lined water heaters manufactured after 3/1/97. 1-3/8" dia. flange. Screw in. 14" min. tank dia. Amalloy. 5 yr. warranty. Blistercard. Manufacturer number: 9002442045. Country of origin: United States. Distributed by Reliance Water Htr/State.