Amtrol® Therm-X-Trol® Thermal Expansion Tank, Series: ST-CL, 34 gal Tank Volume, Acceptance Volume: 27 gal, 150 psig, ASME Yes/No: Yes, 20 in Dia, 35 in Height, Carbon Steel, 55 psig Pre-Pressure Rating, 240 deg F Maximum Temperature, FNPT, 1 in, Red Oxide Primer, Domestic