Fitment 13398DO slide controller for Sync II, suit for InWall SlideOut on RV. The c2 controller has been discontinued and The DO is the upgraded version,replaced the 13398C2 Prevent leakage The trailer manufacturer placed the controller on the floor, under a sink behind an invisible panel. Water can easily damage the original controller, leading to water leakage in the bathroom of the travel trailer. Replacing this original equipment and installing it on the wall can effectively prevent water leakage Direct replacement Plug and play perfection, plugged in the controller and slide outs work perfect again Easy to display The controller has 2 LED,1 green and 1 red, are provided to indicate current controller status and faults Note Please confirm the model before purchasing,just need to remember to be very gentle with the reset button otherwise it comes off and cannot be reset