Bigshaft, I believe yours is setup like mine. The pull handle closest to the front is your gray tank valve for your bathroom. The pull handle next to it is for your black water tank, and the pull handle in the back is for your gray tank to your kitchen... Hint: if you look underneath the rv at the location of the second pull handle from the front, that drain pipe should be larger in diameter then the front drain. Thats how I originally figured it out myself.