Can be used on most Truck Racks / Van Racks / SUV Racks Cast Aluminum door and end cap, Stainless Steel saddle brackets U-bolts and hardware Spring loaded door latch and urethane gasket for weather resistance The end cap comes with the rotary tongue lock Required for Assembly: 4" pvc pipe (actual 4.5"), silicon or butyl sealant AA Products conduit carrier transports pipes, rods and other materials within a 4" PVC pipe Required for Assembly: 4" pvc pipe (actual 4.5"), silicon or butyl sealant. No Drilling required for installation. Secures onto the crossbars. UPC: 810029492317