It's those darn sewer hose gremlins! Everybody's got them. They come out when you are travelling down the road, start pushing on the cap to work it loose so they can escape.
Some folks put a small, SS screw at the top of the end bumper and attach it to the cap with a nylon fishing line. Might work loose but it won't fly off.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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