Abstract: A universal coupler 10 for coupling an accessory to equipment such that the accessory can rotate about the equipment, the coupler 10 consisting of a fixed attachment 12 for attaching to the equipment, a mobile attachment 14 for attaching to the accessory and which rotates about the fixed attachment, and a rotation system 16 having a drive shaft 38 for rotating the mobile attachment 14. The rotation system 16 includes a rack-and-pinion system which is driven by an actuator 44. The coupler 10 allows for the rapid mounting of a plurality of accessories or implements to the coupler 10, and enables the rotation of the mounted accessory or implement when the coupler 10 is itself mounted to equipment.