Used 235 square feet vertical exchanger. Manufactured by JD Cousins Inc. Shell rated 100 psi @ 350F. T304 Stainless Steel Tubes rated 15/FV @ 300F. (30) 2" tubes X 0.065". Stainless steel heads. Carbon steel shell 18" X 15' long. Lug Mounted. National Board #7677. Serial #1202-13. Built 2003.