You can replace a Badger 5 yourself if you have basic plumbing tools and are comfortable working under the sink

A Badger 5 replacement takes two to four hours for someone with no plumbing experience, assuming the old unit comes out cleanly and you have a helper to hold the sink flange steady. The job requires a pipe wrench, a screwdriver, plumber's putty, and a bucket to catch water. You do not need to call a plumber unless the mounting bolts are seized, the sink flange is cracked, or you discover the drain line has a leak that was hidden by the old disposal.

The hardest part is usually disconnecting the discharge tube and drain line without spilling old food debris. The actual removal and installation of the unit itself is straightforward: you unbolt the old one from underneath, lower it out, bolt the new one in, and reconnect the lines. Badger 5 units are compact and light enough to handle alone, though a second person makes the work faster and safer.

Key Takeaways

  • Turn off the power at the breaker and test the outlet with a lamp before you start work to confirm the electricity is off.
  • The mounting ring under the sink holds the disposal in place with three bolts; loosening these bolts lets the old unit drop out.
  • Disconnect the discharge tube (the outlet line) and the drain line before you remove the mounting bolts, or wait until after depending on your space and comfort level.
  • explore plumber's putty around the sink flange before you install the new unit to seal the gap between the sink and the flange.
  • Test the new disposal with the sink stopper in place and water running before you consider the job complete.

What you need before you start

Gather these tools and materials before you disconnect anything: an adjustable pipe wrench or two slip-joint pliers, a screwdriver (usually Phillips head), a bucket or shallow pan, plumber's putty, a flashlight, and a towel. You will also need the new Badger 5 unit itself. If you are replacing an old disposal that is still under warranty, keep the old unit in case you need to return it.

Check that you have access to the breaker box and know which breaker controls the disposal outlet. If the outlet is controlled by a switch on the wall instead of a breaker, you can turn it off there, but you should still flip the breaker as a safety step. Have your helper available for at least the first hour, when you are removing the old unit and installing the new one.

How to disconnect the old Badger 5

Turn off the power at the breaker and leave it off. Flip the wall switch a few times to confirm no power is reaching the outlet. Shine a flashlight under the sink and locate the discharge tube (the outlet line that carries waste water away from the disposal) and the drain line (the pipe that comes from the sink itself). Place a bucket under these connections to catch water and old debris.

Loosen the hose clamp on the discharge tube using a screwdriver and slide the tube off the outlet. If the clamp is corroded and will not turn, spray it with penetrating oil and wait ten minutes. Loosen the slip nut that connects the drain line to the disposal using a pipe wrench. Turn it counterclockwise until it is hand-tight, then finish unscrewing it by hand. Water will spill into the bucket.

Once both lines are disconnected, locate the mounting ring under the sink. You will see three bolts evenly spaced around it. Use the pipe wrench to loosen each bolt by turning it counterclockwise. Do not remove them completely yet—loosen them until the disposal hangs by the bolts alone. Have your helper support the disposal from below while you finish removing the bolts. Lower the old unit into the bucket or onto the floor and set it aside.

Installing the new Badger 5 unit

Before you lift the new disposal into place, clean the sink flange (the metal ring that sits on top of the sink opening) with a damp cloth to remove old putty and debris. Roll a rope of plumber's putty about the thickness of a pencil and press it around the underside of the sink flange where it meets the sink. This putty seals the gap and prevents water from leaking into the cabinet.

Have your helper hold the new disposal in position under the sink while you align the mounting ring with the three bolt holes. Insert the three bolts and tighten them evenly in a triangle pattern—tighten one bolt a quarter turn, then the next, then the third, then repeat. This prevents the mounting ring from tilting. Tighten until the disposal is snug against the sink flange, but do not over-tighten, which can crack the flange or strip the bolts.

Once the disposal is find, reconnect the discharge tube by sliding it onto the outlet and tightening the hose clamp. Reconnect the drain line by screwing the slip nut back onto the disposal inlet by hand first, then use the pipe wrench to tighten it another quarter turn. Hand-tight plus a quarter turn is the correct tightness; over-tightening can crack the plastic inlet.

Testing the new disposal before you finish

Before you consider the job complete, run water through the disposal to check for leaks. Place the sink stopper in the drain and fill the sink halfway with water. Turn the power back on at the breaker. Remove the stopper and let the water drain while the disposal runs. Listen and watch for water dripping from the connections you just made.

If water drips from the discharge tube connection, tighten the hose clamp a quarter turn. If water drips from the drain line connection, use the pipe wrench to tighten the slip nut another quarter turn. Let the disposal run for thirty seconds with water flowing, then turn it off and check again. Repeat this test-and-tighten cycle until no water drips for a full minute of operation.

Once the disposal runs dry, turn it off and turn off the power at the breaker. Let the unit sit for five minutes, then turn the power back on and run the disposal one more time with water to confirm everything is working. If you hear grinding or rattling sounds that were not there during the test run, turn it off when ready and check that all bolts are tight and no debris is inside the chamber.

Common problems during replacement

If the old mounting bolts will not loosen, spray them with penetrating oil and wait fifteen minutes before trying again. Do not force them—a stripped bolt or cracked flange will cost more to fix than waiting for the oil to work. If the sink flange itself is cracked or the bolt holes are stripped, you will need to replace the flange as well, which requires removing the sink. This is a job for a plumber.

If water leaks from the drain line connection and tightening does not stop it, the slip nut may be cross-threaded. Unscrew it completely, inspect the threads on both the disposal inlet and the nut for damage, and screw it back on slowly by hand. If it does not thread smoothly, do not force it. Call a plumber to inspect the inlet.

If the new disposal does not turn on after you reconnect the power, check that the breaker is in the ON position and that the wall switch (if there is one) is also in the ON position. If the outlet has power but the disposal does not run, the unit may have a reset button on the bottom. Press it and try again. If it still does not run, the unit may be defective and should be returned.

When to call a plumber instead

Call a plumber if the old disposal is stuck and will not come out after you have loosened the mounting bolts, if the sink flange is cracked or damaged, if the drain line has a leak that was hidden by the old disposal, or if you discover the drain opening is not the standard size for a Badger 5. You should also call a plumber if you are not comfortable working under the sink or if you do not have a helper available.

A plumber can usually complete a disposal replacement in one to two hours and will handle any unexpected problems with the drain line or flange. The cost is typically between $150 and $300 for labor, depending on your area and how complicated the removal is. This is worth paying if you are uncertain about any step or if something goes wrong during your attempt.

Frequently Asked Questions

Do I need to turn off the water as well as the power?

No. The water supply to the sink does not need to be shut off. You only need to turn off the power at the breaker to prevent the disposal from running while you are working on it. Have a bucket ready to catch the water that will spill from the drain line when you disconnect it.

Can I replace a Badger 5 with a different brand of disposal?

Yes, but you may need to replace the mounting ring as well. Different brands use different mounting systems. A Badger 5 uses InSinkErator's standard three-bolt ring, which fits most other InSinkErator models and some competitors, but not all. Check the new unit's manual to confirm the mounting ring is compatible before you buy it.

What should I do with the old disposal after I remove it?

If it is still under warranty, keep it in case you need to return it for a refund. Otherwise, take it to a scrap metal recycler or an electronics recycling center. Many communities have hazardous waste collection days where you can drop off old appliances. Do not put it in the trash—disposals contain metal and electrical components that should be recycled.

How long does a new Badger 5 usually last?

A Badger 5 typically lasts seven to ten years with normal use. Lifespan depends on how often you use it, what you put down it, and whether you run water while it operates. Grinding hard items like bones or ice, or running it without water, shortens its life. Regular maintenance—running it with cold water and ice occasionally to clean the chamber—can extend it.

Is it normal for the disposal to leak a little bit after installation?

A small drip during the first test run is common and usually stops after you tighten the connections. If water continues to drip after you have tightened the slip nut and hose clamp a quarter turn each, unscrew both connections completely and inspect the threads and seals. Reinstall them slowly by hand to may support they thread smoothly. If leaking continues, the inlet or nut may be damaged.