litter-robot by whisker Installing the Litter-Robot Ramp Adapter Litter-Robot 4 (with step or handle) can be equipped with the Litter-Robot 3 Ramp using an adapter bracket. No tools are required for installation. © Cather the Litter Robot 3 Ramp and 9 adapter bracket. © Place the ramp above the step and install 9 the ramp by inserting the bracket into the grate of the step as shown. Installation: son is how complete. Note: To access the waste drawer, simply lift the ramp off the step and set aside.