Thermal Expansion Tank designed according to ASME CODE Section VIII - Div. 1, UM Stamped for sizes up to 37 gal. and U Stamped for larger sizes, Max working pressure: 150 psi, Max. temperature: 240 F (115 C), Factory precharge pressure: 40 psi for sizes up tp 37 gal. and 55 psi for larger sizes, complete with removable heavy duty blasser suitable for use with potable water and stainless steel water connection, Finish: Automotive gray finish paint, Acceptance volume: 90% of tank capacity "at atmospheric pressure"