How to Install a Garbage Disposal in a Double Sink

Kitchen garbage disposals have been around since the late 1930s and today have become a standard item in new homes and kitchen remodels. Disposals come in many different price ranges, with the more expensive models offering stainless steel cutting blades and insulated motors for quiet operation. The disposal is mounted under your kitchen sink and is usually operated with an electrical wall switch. After it is turned on, your garbage disposal grinds up food waste so that it may pass through the drain pipes and into the sewage system.

A garbage disposal allows you to wash away food particles.
  1. Detach the drain lines from underneath the kitchen sink by rotating the attaching nut counterclockwise with a pipe wrench. Move the drain lines out of the way so that you will have plenty of room to work.

  2. Remove the drain basket assembly from the side of the sink in which you want to install your disposal. Rotate the ring nut on the drain basket from underneath the sink counterclockwise with slip-joint pliers. Clean the mounting surface inside the sink with a sponge and mild detergent.

  3. Install the sink flange that came with the garbage disposal into the sink hole from the top of the sink. Apply a bead of plumbers putty between the flange and the sink's mounting surface.

  4. Install the garbage disposal mounting assembly to the bottom of the sink. Hold the gasket in place and attach the mounting assembly to the sink flange by tightening the three screws with a Phillips screwdriver.

  5. Clean any excess plumbers putty from the sink bowl that may have squeezed out with a sponge.

  6. Attach the small, black discharge pipe to the garbage disposal using slip-joint pliers.

  7. Remove the plug from the dishwasher drain on the garbage disposal by knocking it out with a screwdriver. Do not remove the plug if you do not have a dishwasher.

  8. Mount the garbage disposal to the bottom of the sink. Raise the disposal so that the mounting tabs slip into the mounting assembly. Tighten the mounting assembly ring clockwise with a screwdriver.

  9. Make sure the discharge pipe on the disposal lines up with the sink trap. Reconnect the drain lines to the discharge pipe and tighten the nut with a pipe wrench.

  10. Connect the drain line from the dishwasher to the dishwasher drain connection on the disposal by pushing it into position and tightening the clamp with a screwdriver.

  11. Plug the disposal's power cord into a GFCI (ground fault circuit interrupter) receptacle.