A coupler is the connection point mounted on the trailer which connects the trailer to the vehicle. When replacing a coupler there a few things that you have to know. First, what is the hitch ball size for the coupler. Secondly, what type of trailer do you have (Straight Tongue or A-Frame)? Lastly, what is the Gross Trailer Weight of the Trailer. These are the basic questions for finding the correct coupler replacement. Demco couplers are of the highest quality steel construction featuring: Adjustable lock nut for proper ball tension, Locking hole in coupler handle and Positive locking trigger. Maintenance free with no grease or adjustments needed, our EZ Latch couplers are available in a variety of styles and weight ratings to perfectly match your towing need. From channel and tube mounts to A-frame couplers, virtually any load can be secured with a Demco EZ Latch. And with our automatic locking mechanism, you can be sure that your load is locked and safe the very first time you use it -- and it won't let you down as you use it over and over.