Try releasing the pressure
Have you tried to release any pressure on that connection. On mine there is a check valve in that connection and if there is pressure behind it, usually caused by turning on the faucet with no hose connected, it can be a bear to engage. if you turn off all water going to the rig and make sure the pump is off then turn on the cold low point valve on to drop any pressure making sure the faucet at the shower has the cold handle on, it should release any pressure behind the check valve, and might just do the trick.
Good Luck !
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Steve Bemis
2018 Montana 3560RL
2015 Ford F350 6.7 B&W Companion
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