Dutton-Lainson Dutton Lainson Coupler Repair Kit. Housing width measures to 3 in. I.D. and 3-1/4 in. O.D. For 1-7/8 in. ball. Repair kit for coupler included only. Features of Dutton-Lainson 13968 Dutton Lainson Coupler Repair Kit Repair kit for Class I Coupler For gross weight not exceeding 2000 lbs. Housing Width: 3 in. I.D. 3-1/4. in. O.D. Quick and easy to use Package Contents: Dutton-Lainson 13968 Dutton Lainson Coupler Repair Kit Dutton-Lainson 13968: Dutton Lainson Coupler Repair Kit