Amtrol® Therm-X-Trol® Thermal Expansion Tank, Series: ST-440C, 53 gal Tank Volume, 53 gal Acceptance Volume, 125 psig, ASME Yes/No: Yes, 24 in Dia, 45 in Height, Steel, 55 psig Pre-Pressure Rating, 240 deg F Maximum Temperature, FNPT, 2 in, Red Oxide Primer, Domestic