Abstract: An adaptor allows a trailer coupling designed to be used with an annular eye-type trailer drawbar to be quickly and easily changed into a standard ball-type coupling. The adaptor includes a crossbar that mates with the arcuate surface located at the inside bottom portion of the pintle. The adaptor includes parallel side-by-side vertical mounting plates that fit over the pintle and have aligned holes extending through them. A bore is placed in the body of the trailer coupling coaxially with the holes in the mounting plates when the adaptor is mounted on the coupling. A pin is inserted through the aligned mounting holes and bore, securing the coupling to the adaptor. The existing latch on the trailer coupling will engage the top of the pintle and prevent the unintended or accidental uncoupling of the adaptor from the coupling. The adaptor may easily be removed and the coupling returned to its former configuration.