2 Pass 8" Series 7000 Copper/Aluminum Power Steering Kit This little two-pass Tube & Fin power steering cooler uses 1/2" copper tubing expanded into aluminum cooling fins to extend pump and seal life and improve steering performance. It incorporates mounting brackets to make installation a snap. Feature 11/32" hose barb inlets. 2 Pass 8" Series 7000 Copper/Aluminum Power Steering Kit .