https://www.etrailer.com/Lunette-Ring/Curt/C48550.html
Today we’re going to be taking a look at part number C48550. This is the CURT Lunette ring, rated at 35,000 pounds. The Lunette ring is going to bolt onto the front of your trailer so that you can couple it to a pintle hook. It is a bolt-on installation. You’re going to have the 4 pre-drilled mounting holes that are going to provide simple installation. Hardware is going to be sold separately but you can purchase a hardware kit with Grade 8 hex bolts, part number C48330.
Note: Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
An explanation of the operation of the king valve and where it is used.