Used- APV Plate Heat Exchanger, Model R51TH#11. Approximately 3000 square feet. (566) 16-1/2" wide x 60" tall stainless steel plates, working pressure 200 psig. 4" Inlet & outlets. Includes (2) spacers with 2-1/2" tri-clamp inlets & outlets, and (1) spacer with 2" tri-clUsed- APV Royal Paraflow Plate Heat Exchanger, Model R50.amp inlets & outlets. Expandable stainless steel frame, Serial# 20003003000545, built 2000.