A coupling device (10) for allowing a user to connect a trailer (104) having a gooseneck assembly to a hitch ball (102) of a towing vehicle (106). The coupling device includes a housing (12), jaws (24 and 26) and a locking mechanism (32). The jaws are pivotably mounted in the housing and are biased into the open position by springs (30). The locking mechanism includes a locking slide bar (38) which moves across the front of the jaws when the jaws are in the closed position. When the jaws are in the open position and the locking slide bar is unlocked, the jaws prevent the locking slide bar from moving to the closed position. When the hitch ball is moved between the jaws, the jaws move to the closed position and, the unlocked, locking slide bar automatically moves to the closed position.