This actuator has a self-latching coupler that is unique to UFP. You just lower the actuator onto the ball and the latch system will open and close around the 2" ball. Corrosion resistant aluminum master cylinderTuned output pressure specifically for drum brakesThe actuators inner member contains all working parts. It can be completely removed for repair or replacementOuter housing mounting holes are spaced 3" apart and ¾" down from mounting surface compatible with other brands such as Titan, Tie Down, and DemcoSmooth, Responsive Performance