The Shocker Replacement U- Pin is the Locking Pin for the Shift Lock Gooseneck Coupler. This U-Pin is available for gooseneck hitches with the shift lock coupler for 2-5/16″ and 3″ balls. Fits Shocker gooseneck surge air hitch & coupler models, including the 30K gooseneck, 9″ offset, and 40K gooseneck air hitch & coupler.  Available for the Shift Lock Coupler for 2-5/16″ and 3″ balls. This part comes with a 5/8″ diameter U-Pin with formed, hardened, and plated shafts designed for the Shocker gooseneck air hitch with shift lock coupler. With an easy installation, you can restore your Shift Lock coupler in a matter of minutes!