Amtrol T-5 THERM-X-SPAN Expansion Tank, 2.0 Gallon (140-735) The Amtrol THERM-X-SPAN T-5 Expansion Tank has a steel shell, plastic liner, and rubber diaphragm with a brass system connection. The maximum operating temperature is 200ºF and the maximum working pressure is 150 PSIG. Unit comes with a 40 PSIG factory precharge. Amtrol THERM-X-SPAN T-5 Expansion Tank Specifications: • Tank Volume (Gallons) - 2.0 • Max. Accept Factor - 0.45 • System Connection (Inches) - 3/4 • Height (Inches) - 12-5/8 • Diameter (Inches) - 8 • Shipping Weight (lbs.) - 5 • Temperature = 200°F. Maximum Working Pressure = 150 PSIG • Factory Precharge = 40 PSIG"