2510h valve
 

What is the valve located at the front curbside outside of the camper for?

Think you'll find that's the fresh water tank drain.
Tree

That would explain why nothing came out when I unhooked from city water today. Where is the low point drain for the system?

It only drains water from the fresh water tank, which is not filled if you are hooked to city water. You'll probably find some other drains in the hot and cold water lines between where you find the water pump (if you're using water from the tank) and the faucets in the kitchen and bathroom. These drains will empty the water lines that go to the faucets (if you open them so air can get in). They drain under the trailer. You have to make sure they are closed before you go camping. If you see water coming out when you turn on the pump or are connected to city water, one or both of them is open.

- Jack

Thank you for the information

The easiest way to find the low point drain valves is to look under the trailer for two short pipes sticking down. The valves will be directly above them inside. Make sure they are closed before winterizing. You can pump a gallon of antifreeze on the ground in a hurry. You need not ask me how I know. :)

I don't have to ask, Rich. Your post reminded me how I found out about this "feature" myself! :o :o

- Jack

Guess I ain't alone...LOL glad it relatively cheap

My trailer doesn’t have such drain valves. At least I’ve never found any.

On my 22td the drains are under K sink goin thru floor