Sewer hose sealer

[Outbumn]

some time ago I saw an ad for a donut that sealed the opening in the wet bay when the sewer hose was connected. At the time we had a Winnebago and the opening was not round and the seal would not work. Now we have a Tiffin with a round hole and am looking for a way to seal the opening.

Anyone remember this product and point me in the right direction or give me some suggestions.

Thanks,
Ron

[Outbumn]

Found it - RV Critter Guard

Does anyone use this product?

[FatChance]

I got a anti-fatigue floor mat at Home Depot. I measured and cut a hole the size of the drain hose then made a cut from the edge of the mat to the hole to make it easy to install/remove the drain hole. Works great, seals out outside temperature extremes and rodents.

[ByeTheWay]

I use steel wool.