Expansion Tank, Potable Type, 4.5 gal. Capacity, 3/4 inch Connection, Male Connection, Butyl Rubber Diaphragm, Stainless Steel Inlet Connection, Temperature Rating: 200 Deg F, Usage: Used With Most Standard Hot Water Heaters And Storage Tanks, Dimensions: 15 inch x 11 inch dia., Working Pressure: 150 psig, Acceptance Volume: 2.8 gal., Standards: IAPMO listed and ANSI/NSF 61 Certified