TTP THERMAL TRANSFER PRODUCTS EKT-1024-97779 HEAT EXCHANGER.
This is an oil tank/hydraulic oil shell and tube heat exchanger. Note that the design is a bit different than some EKT models in that one of the large diameter ports does not come through the flange and would need to be plumbed differently. 23” between flanges. Large tank flange is 10.38” diameter. 1" and 1.5" NPT ports.