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PullRite's Quick Connect system relies on close-tolerance hardware to lock your fifth-wheel king pin in place, and this cap and plate assembly is one of the components that makes that connection work as designed.
It's built as a companion part for compatible PullRite Quick Connect setups, using durable nylon and powder-coated metal to hold up under the constant stress of hitching and towing.
If your Quick Connect setup calls for this cap and plate, it's a straightforward way to keep the system working the way it was designed to.