Used 45 sq ft Enerquip Inc horizontal all sanitary T-304 stainless steel U-tube bundle heat exchanger. 6-1/2 diameter x 10' long stainless steel shell. (1) welded head (1) flanged head. Shell and tube sides rated 150 PSI @ 375 deg F. S/N 3665. National Board # 2381. Built 1998. Shell and heads T-304L stainless steel. Tube side T-316L stainless steel. (13) tubes .625 diameter.