Used Rubicon approximately 40 gallon vertical stainless steel pressure tank. 23" diameter X 23" straight side. Internal rated 50/FV @ -20 to 300 degrees F. National Board # 836. S/N 1687-6. Top Fittings: (3) 1". Side fittings: (3) 1 1/2", (1) 8" handhole and (2) 3/4" for external level indicator. 1 1/2" center bottom drain.