PullRite Quick Connect Capture Plate Trailair Tri Glide Airbag/Shock 12 3/4". Most QuickConnect applications slip over the king pin and are held in place by a set screw and nylon spacer holding it onto the king pin box. When the trailer is hooked up to the hitch the Capture Plate's wedge isolates the king pin from turning in the fifth wheel plate causing the Cam Assembly to activate and allowing the SuperGlide to move as turns are being made. Note: Use Straight edge when measuring to the leading edge of the kingpin box for measurements "B" and "C". CAUTION: Measurement "A" cannot be smaller than noted. Quick Connect Capture Plate #331757 is designed to fit Tri Glide king pin boxes that are 12-3/4" wide. Features of PullRite 331757 Quick Connect Capture Plate Trailair Tri Glide Airbag/Shock 12 3/4" Fits Tri Glide king pin box that is 12-3/4" wide only Prevents trailer from hitting the cab of your truck Quick installation and removal Finish: Black Powder Coat 5 year limited warranty Package Contents: PullRite 331757 Quick Connect Capture Plate Trailair Tri Glide Airbag/Shock 12 3/4" PullRite 331757: Quick Connect Capture Plate Trailair Tri Glide Airbag/Shock 12 3/4"