Don’t you have a screw in plug for the hole. I had the same problem in my ‘19 Forza and resolved it by cutting the tabs down on the hose end that You stick up thru the floor.
X2, that also worked for my 2014 Sunstar 26HE.
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2023 Newmar Bay Star 3014, towing 2014 Honda CRV
2017 Winnebago Adventurer 35P
2013 Itasca Sunstar 26HE