Originally Posted by Fr3 Dad
Right TLAK... The problem is... They are not draining. When opened, they release only the residual water in the lines, it appears as though (I could very well be wrong) that one of the lines is just as the sticker says, a low point to drain the water lines in the coach, and the other is to drain the contents of the fresh water tank. Water will come out of one of the lines but only when pressurized by the pump.
The low point drains (there should be two, hot and cold, red and blue) will only drain if opened and you open up the faucets upstairs. Open them all up to drain them all out..
I think you said there were two blue lines there at the low point. If so, then one is the cold water low point drain and the other is the tank drain. Generally speaking (not necessarily for all models), the low point drain has a screw cap or pull valve on the end of it and the tank drain has an in-line valve higher up. If you follow that second blue line straight up into the house, that's most likely where you will find that valve. It can't be higher than the bottom of the tank, obviously, so the choices are limited. But it can be in any number of odd places, ranging from an exterior compartment (some of which have inner compartments) to under the sink, to under the bed, in some other cabinet or hidden compartment (the cover of which may require a screw driver to remove). Keep looking, it's there to be found.