Watts 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank

You're sure to have hot water when you need it with the Watts Pre-Pressurized Steel Water Expansion Tank. Made from strong, durable steel, this tank can be used with gas, electric or oil heaters. An expansion membrane prevents air and water contact, with a rubber diaphragm that flexes when water heats.