Amtrol® Therm-X-Trol® Thermal Expansion Tank, Series: ST-CL, 22 gal Tank Volume, 11 gal Acceptance Volume, 150 psig, ASME Yes/No: Yes, 16 in Dia, 35 in Height, Carbon Steel, 55 psig Pre-Pressure Rating, 240 deg F Maximum Temperature, FNPT, 1 in, Red Oxide Primer, Domestic