ARC-30 Hydraulic Oil Cooler for Truck hydraulics systems. This unit is rated and will cool up to 30 GPM of Oil for operating Truck hydraulics, used in chemical, crude oil transports, propane, ect. These units are Made in USA, and what sets these coolers apart from other brands are, cage type fan, all steel tubing, not hoses that wear out, like other brands. Thanks for looking