Thanks Jack. I bet that is the one I am looking for. It sounds like the description in the manual. As to the white one, I filled the tanks and added chlorine to sanitize them and when I went to drain it from this valve, only a very, very small trickle would come out. I will try to check and see if it is stopped up but at the rate it was coming out, it would have taken a week to dump that much water. I finally emptied the tank by using the sink, lavatory and shower. Thanks for your help.
