Universal Class 1 Coupler Repair Kit for D-L Class 1 couplers by Dutton Lainson. Class 1. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost. Repair kit for D-L Class 1 couplers. Includes the entire ball clamp assembly, for quick changeout. Easy to assemble- can be adjusted by hand without any tools. Fits models 940, 950, 960, and 970. Meets SAE and V-5 standards. For use with D-L couplers only.