OK I am late to the game on all this, I installed the Mishi before knowing all this as I just got my first ST 2106. I want to with to the 14-15 lines as I get that's the solution but I don't understand what happens at the Mishi where it connects. The 16 has 2 connectors the 15 has 1 . So my question is what happens on the second hose connector on the Mishi "T".? Am I supposed to cap it?