I installed that rubber stopper, the expanding type with a screw and wingnut, back in late 2016 after I discovered that it would drip down underneath the RV and empty the tank in a few days. Really annoying. I found that those bayonet valves used by Winnie under there tended to have a leakage problem from mostly the spiral cable. It would come detached easily due to poor design and then wouldn't allow the bayonet to completely close. Then I also read that the small bayonet valve itself wouldn't work for very long.
The clamp on the spiral cable comes loose up in the wet compartment. Where mine was I'd have to remove too much to access it so I didn't want to bother.
Okay, with that information, I wasn't about to mess with repairing it every two years or so and since I'm a full timer, I didn't need to drain the tank all that often anyway so the stopper was installed. I've never removed it AND it's never dripped again even after 7 years in place.
So, there's no worry about them coming out due to a bumpy ride.
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