National Dolphin Dumping Question

RSturm wrote:
Hello,

We just purchased a 2002 National Dolphin and can't be sure which valve is for black water and which is grey water.

Can anyone help me solve the mystery?

Thanks so much!

Richard

Picture the valves:
https://www.dropbox.com/s/ajjulaic2c90qj7/IMG_1187.JPG?dl=0

Now that you have that info, you might want to form a practice for the dumping procedure.
Ideally, you should dump the black tank when 3/4 full for the best results, but your mileage may vary on this and especially if you're planning on a couple of nights without in your travels and before reaching another place to dump.
We also shut the valve on the grey tank,(which is usually open when hooked up) the day before leaving, so once the black tank is drained and the valve has been shut, the grey water can be used to flush the hose. Doesn't hurt to run a gallon or two of fresh water into the black tank, either. We only use chemicals, for long term, use a lot of water when flushing the toliets and dump often, like within a 4 day period.