How to prevent someone from dumping in the wrong place

[Neal]

I can't find the thread but I recall @Deer Springs RV Park had an incident where someone dumped in the wrong PVC pipe. I recently stayed at a campground and they have a nice way of preventing this.

 

[MemoriesByTheMile]

I don’t think that would stop cousin Eddie.

 

[Buc]

 

[Rich W.]

View attachment 25192

Won’t be dumping there