Used Mueller Accu-Therm 153 sq ft stainless steel plate heat exchange. Has (32) 55" x 17" plates. National Board # 40594. Model AT40 F-20. Serial # 344764. Maximum working pressure is 150 psi @ 350 deg F. Minimum Design Metal Temperature is 32 deg F @ 150 psi. Maximum pack length for 18 plates is 4.23" and minimum is 4.08" (currently with 31 plates is 7"). Heat exchanger has (4) 3" sanitary Tri-Clamp inlets/outlets. Gasket material is EDBM. Plates are on stainless steel rods that connect to carbon steel ends. Built in 2005. Good condition.