20,000lb Capacity Disc Brake Actuator with 2-5/16" CouplerThe Model works by the "surge" or "push" of the trailer toward the tow vehicle. This automatically synchronizes the trailer brakes with the brakes on the tow vehicle. When the trailer pushes against the tow vehicle, the actuator telescopes together and applies the force to the master cylinder, supplying hydraulic pressure to the brakes. The built-in, sealed, independent dampening shock absorber controls the telescoping shock against the hitch.Be sure to comply with the regulations for brakes in the state. Brake laws are sometimes minimum standards, and users may wish to add brakes to a trailer to meet minimum Gross Vehicle Weight Ratings (G.V.W.R.). Note: G.V.W.R. is the Gross Vehicle Weight Rating, which includes the trailer and the load weight as a total gross weight.Read the tow vehicle owner&&';;s manual on towing capacity and other towing recommendations before installing brakes or this actuator.Features: 20,000 lbs. capacity Fits 2-5/16" in. hitch ball For use with disc brakes Maximum Actuator Capacity:Gross Load: 16,500 lbs.The actual in-service rating is limited to that of the ball and hitch or the least-rated component on the tow vehicle or trailer being used, or the trailer manufacturer&&';;s G.V.W.R. shown on the certification label, whichever is lower (note: G.V.W.R. is the Gross Vehicle Weight Rating, which includes the trailer and the load weight as total gross weight.