CURT Channel Mount Pintle Attachment with 2-5/16-Inch Ball, 20,000 lbs, Shank Required Model 45922CURT Channel Mount Pintle Attachment with 2 5 16 Inch Ball, 20,000 lbs, Shank Required Model 45922 This replacement ball and pintle combination head offers versatile towing options and is designed to fit the CURT adjustable channel mount #45908. It features a standard 2 5 16 inch diameter trailer ball to fit any 2 5 16 inch trailer coupler. With its integrated spring loaded arm, the ball pintle combination can also be coupled to a 2 1 2 inch or 3 inch