18'' X 13'' Single Pass Oil Cooler with 3/4'' Female NPT18'' X 13'' Single Pass Oil Cooler with 3 4'' Female NPT CORE HEIGHT: 12'' CORE WIDTH: 13 3 4'' CORE THICKNESS: 1 1 2'' OVERALL HEIGHT: 13'' OVERALL WIDTH: 18'' FITTING INLET: 3 4'' Female NPT FITTING OUTLET: 3 4'' Female NPT FLOW RANGE GPM: 4 20 HEAT REJECTION BTU HR: 16,500 21,500 Single Pass Air to Oil Max Operating Pressure at 200 psi, Requires 2 Mounting Kits KA74138 RTF Round Tube and Fin Design with Female 3 4'' NPT Related Parts KA74138