Thermal Expansion Tank Maximum Operating Pressure 150 psi Maximum Operating Temperature 210 Degrees F Outside Diameter 11 in Overall Height 12 in Pipe Size 3/4 in Tank Capacity 4.5 gal Precharge Pressure 40 psi Connection Material Stainless Steel Diaphragm Material Butyl Rubber Expansion Tank Type Diaphragm Manufacturer Warranty Length 5 yr Market Residential Precharged Yes Standards Complies with NSF 61 Lead Free UPC Tank Material Stainless Steel Thread Type MIP