Designed and manufactured by Elbi since 1975, the XT-XTV Series diaphragm expansion tanks are available in sizes from 2 gallons to 80 gallons, in either in-line or stand models. The two-shell welded construction allows the tank to withstand high-pressure ratings, adding safety to the system. The SBR diaphragm separates the air from the water and prevents waterlogging, while also helping save space and energy. The product is intended for use in hot water, solar and cooling systems, and is compatible with glycol. Elbi of America Inc., Card No. 311