Abstract: A coupler (10) for securely attaching an accessory to an excavator arm of an excavator. The coupler (10) comprises a first half (16) for connecting to the excavator arm and a second half (18) for connecting to the accessory. The second half comprises a front jaw with a movable front latch associated therewith, the front latch having a latching position and a non-latching position, and being for latching one of two attachment pins of the accessory within the front jaw when it is in its latching position. The second half also has a rear latch, the rear latch having a retracted position and an advanced position, and being for engaging a second of the attachment pins when it is in its advanced position.