Sewer pipe
Unless you have a composting toilet, you need a sewer pipe. How else do you think everything that goes down your toilet is going to end up in the sewer?
It's the least fun part of the RV, but it's a necessary evil.
The Camco SUPER 20ft RV Sewer Hose Kit is the perfect product for that job! Ready to use with two heavy duty 10 foot hoses, this kit includes everything you need and more! As an added bonus, you have a transparent extender so you can see when your tank is empty, along with two bayonets and two end caps for storage.