This Vacuum attachment is designed for the 14" K&M Rock Crusher.
It attaches to the exit port of the crusher, then you attach a 2" hose to the round exit port and then attach to your Shop Vac. You can also add a Dust Deputy Cyclone to the side port.
To attach the Vacuum Port, slide it completely up on the crusher then tighten the 5/16" bolt provided and lock it down with the 5/16" nut.