The lights on the tank will be led's also & will run off a 9v. As for a Newton dump valve! It is a manual valve we use on fire tankers as a quick release to rapidly drain water to a portable tank. We live in a very rural area where water is trucked to house fires, dumped quickly in these portable tanks so fire engines can pump it on the fire. I downloaded two pics to show you. The first is a truck dumping into the portable tank, the second is truck similar to ours were to valve is hidden in a side compartment! The truck i am building halls 2500 gallons of water, or approx. 9500 liters