working pressure tube side 150 psi (10.3 bar) + full vacuum @ 400 degrees F (204 degrees C), shell side 150 psi (10.3 bar) + full vacuum @ 400 degrees F (204 degrees C) single pass 200mm I.D 304L stainless steel shell with expansion bellows (2) 304L stainless steel heads with Tantalum lining (1) flat channel head