If it is like the one on my trailer, I had to turn off the water and remove the pressure from the system. I then used a 1/4 socket extension to push the plunger in the center of the connector that is on the trailer. It seemed to be stuck until I pushed it. Since then it has been stiff but works. When you go to disconnect it is easiest if you push in on the hose then release the coupler.
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R.J. and Ginger
2019 Ram 3500 6.7 HO, Aisin Trans 3:73
Reese Goosebox
2019 Sandpiper 379FLOK
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