Mueller Accutherm plate type heat exchanger, model number AT10 F20, approximately 200 square foot surface area. Includes (128) plates measuring 8" wide X 30" high. Unit rated for 100 PSI @ 190 degrees Fahrenheit. Maximum pack length of 24.57, minimum of 23.74. Includes 2" cold bottom inlet and 1-1/2" outlet, 2" top cold outlet. Good condition.