@Belgain,
I hope too! Ok here is a pic of the valve I am talking about, the more I think about it I suppose you are right. I did flush the tank last week, the leak wasnt immediate, seemed like the next day after which made no sense to me. The spigot I use for flushing is different than the one I use for shore water.
It also seems to leak even if I am not flushing, I "assumed" it had something to do with the sink because of proximity to the sink. I am going to just replace the darn thing with what ever the supplier has, just want the water to stop. I will also add a flow restriction device to protect my plumbing system which I don't have at this point.
The two pipes that are in the second pic is attached to this valve, so these would run directly to the flusher in the black tank and the water it is protecting is the spigot at my house, this doesn't connect to any other water supply in the rv, right?
Thanks for the info and straightening me out