Car & Truck Aluminum Radiator. Radiator Fan & Mounting Kits. Watch our items or add our products to your cart, best offers and coupons will be sent from time to time, or you can make an offer to us at any time. For Heavy Duty Industrial Hydraulic System Cooling. Core (Finned area) Dimensions: 23.6"x 23.5"x 2.56. Inlet Size: -20 SAE O-Ring Seal (1-5/8-12 UN). Outlet Size: -20 SAE O-Ring Seal (1-5/8-12 UN). Overall Dimensions: 30.8" x 25.7" x 2.56. Max Working Pressure: 250 psi. Hydraulic oil coolers, also called heat exchangers, use air or water to cool fluid in ...