[QUOTE=Hohenwald48;431901]Are you going to "T" into the low point drain or into the water tank drain?
The low point drain is on the pressure (output) side of the water pump and not on the input side. It's used to drain all the water out of the plumbing of the TT. If you "T" into the actual low point drain and connect your suction side to that you will have the input (suction) and output (pressure) sides of the pump tied together.
I will "T" into the Aft water tank drain.
The tank drain fitting is on the underside of the tank and has a short 10-inch run to the bracket-mounted drain valve.