Electric fresh water dump

Like the others, I added an elbow and ran the drain line to the edge of my trailer where I added a hand operated valve. Very handy.

That solenoid valve is a diaphragm type valve. It has an orifice and requires a pressure differential to operate. The label on the picture appears to be generic, it does not have information required. If it opened at all, it would take forever to drain, and I am pretty sure the pressure differential would soon not be enough to keep it open and it would close before the tank was empty.

I would use hose and relocate the valve to a ball valve that was accessible. The bigger the water drain, the better.

there are other ways to get the water to come out other than right on top of you. I see a picture above of something I did also. works for me. by the way if you ever find the low point drains they are the same way as the fresh water.

I guarantee that a solenoid located under an RV near the tank is eventually going to fail. The pipe and gravity method is far more elegant. If you incorporate a hose bib fitting on the outboard side, you can attach a hose and water your lawn or garden while you're about it.

SoundGuy wrote:

Boon Docker wrote:
Unscrew the plug, install a 90 degree elbow, connect some PVC pipe to the elbow and run the pipe close to the edge of the trailer. Install a shut off valve on the end of the PVC pipe.

This, except I used braided hose instead of PVC as the water isn't under pressure. FAR simpler than installing an electric solenoid as the OP was referring to. :)

Relocate the drain as shown above.

SoundGuy wrote:

Boon Docker wrote:
Unscrew the plug, install a 90 degree elbow, connect some PVC pipe to the elbow and run the pipe close to the edge of the trailer. Install a shut off valve on the end of the PVC pipe.

This, except I used braided hose instead of PVC as the water isn't under pressure. FAR simpler than installing an electric solenoid as the OP was referring to. :)

Nice, I really like your setup. I really like the idea of a hose instead of PVC pipe because of things like road gators. Nice job!

I can certainly appreciate the notion of automation, but I prefer the idea of extending the existing opening (drain) to an more convenient location and adding a hand operated gate, letting gravity take over.

Adding another electrical device would be one more thing to keep an eye on and maintain to some degree. If voltage is not available (for whatever reason), does the solenoid have a manual override?

Boon Docker wrote:
Unscrew the plug, install a 90 degree elbow, connect some PVC pipe to the elbow and run the pipe close to the edge of the trailer. Install a shut off valve on the end of the PVC pipe.

This, except I used braided hose instead of PVC as the water isn't under pressure. FAR simpler than installing an electric solenoid as the OP was referring to. :)

Boon Docker wrote:
Unscrew the plug, install a 90 degree elbow, connect some PVC pipe to the elbow and run the pipe close to the edge of the trailer. Install a shut off valve on the end of the PVC pipe.

Simple, solves issue of crawling under trailer and it works

I can think of no reason your idea wouldn't work. I have used those valves in other applications and they worked well. You could also just extend your low point drain out to where you can reach it easily and put a manual valve on it. Have fun.