Garbage Disposal Installation Guide for Fresh Users

In your shining kitchen, your garbage disposal will play a certain role. If you possess a great house and love to have a great daily meal with your lovely family, garbage disposal is definitely a great assistant for your kitchens. This garbage disposal installation guide is created to help fresh users have more insight knowledge on how to install and maintain your disposer unit in a proper way.

Good understanding of how your unit operates is quite essential. You can be always right there to handle things strange happening to your garbage disposal or just know what exactly what is running in the machine and keep up with the right idea of something like:

  • It is working great;
  • It got some problems;
  • You can fix it yourself, or you need to call a plumber pro for help.

Garbage disposal installation types

Nowadays, the garbage disposal installation is much easier than before. There are two typical types of installation.

The first is referred to as Quick Lock Sink Mount from InsinkErator, which you can simply twist off the old one and twist on the new one. The similar technique is developed by Waste King, and it is called EZ mount. They are both claimed that their installation is easiest and providing no-hassle installation.

The second one is called 3 bolt-mount garbage disposals. This is original from Waste King Branch. This type of garbage disposal installation is confirmed that providing a firm connection between the sink and garbage disposal but need to be handier to install and more time if you need to remove. Thus, this type is less referred to most of the customers.

Garbage Disposal Installation Guide


  • Screwdriver/disposer wrench
  • Hacksaw/tubing cutter
  • Pliers
  • Circuit tester


  • Garbage disposal
  • Silicone caulk
  • Plumber’s putty
  • Rags

If you’re replacing an old disposal, start with Step 1. If you’re installing a new garbage disposal by connecting it to an existing dishwasher line, start with Step 3.

#1: Shut Down Power. Pull Out Drain Pipes

– Turn off your power. You should respect the safety caution in this step. It is better to let others in the home know that you are shutting it down.

– Remove the existing drain lines. It is OK if there is a leak of water.

– Loosen the base of the sink flange.

#2: Get rid of old putty

– Remove all putty around the sink and make sure no old putty should be left.

– Clean up your sink completely

#3: Connect your Unit

– Remove the cover plate beneath your disposer unit.

– Connect the wire to the outlet beneath your sink. In this step, you should follow strictly to the instruction of manufacture. Most of the garbage disposal has wire connection color to color (white to white, black to black) but you don’t know for sure that is applying in your current models or not; so read the instruction carefully.

#4: Apply Putty

– Fill plumber’s putty around both the underside of the drain flange and the sink opening.

– Place in flange into the drain hole and make sure it firmly and evenly fit into place.

#5: Mounting Unit Over the Flange

– Place the fiber gasket and metal ring over the sink flange.

– Hold the fiber gasket and backup ring in a proper position. A rubber band can well assist you to hold these in the right position.

#6: Add the Snap Ring

– Slide the snap ring up the sink flange until it gets into right position.

– Make the mounting screws tight enough for the entire unit snug and securely in place.

– The perfect position is evenly against the sink with small or no gaps between the unit and the bottom of the sink basin.

#7: Mount the Disposal System

– Insert the disposal to the top end of the mounting gasket. You’ll know you installed it properly if it feels snug. If it does not feel tight enough, try to check other parts again to make sure everything goes right and then adjusts again.

#8: Install the Drain

– Connect P-trap to the tails and trap arm.

– Place the disposal’s discharge tube in the P-trap and do not fully tighten the slip nut.

– Insert other ends of the discharge tube into the disposal unit.

– Use a screwdriver to secure the metal flange using the bolt supplied with your disposal unit.

#9: Tighten Lug

– Place a screwdriver in the mounting lug

– Roll the unit clockwise until the disposer is locked into place.

– Tighten all slip nuts.

#10: Test Disposer

– Turn the power back on. In the previous, power must always be shut down.

– Pull water into the sink.

– Switch on the disposer and check for leaks.

– Tighten any parts if necessary.

Garbage Disposal Maintenance

Things should do

– Keep non-food waste items like paper, wood, metal things out of the disposal.

– Run cold water before the disposal is on for 60 seconds.

– Keep schedule cleaning with citrus every week. Citrus keeps your sink smelling fresh.

Remember: if you find that you are not sure what you should do in the above explanation, you should find a professional plumber.

Garbage disposal as other machines, it still has its lifetime. If your disposal has good performance in over 5 – 10 years, and then it breaks. That is a perfect time to replace it and find a new model for your kitchen. If so, you may want to check our best garbage disposal review as a reference for yourself.

Types and costs

Depending on your reference and priorities for choosing garbage disposal, the best garbage disposal can have a wide range of cost.

The first is the horse power (HP), most of 1/2 HP has cost below $100 and normally satisfies your demand with standard quality. The most popular unit in this class is InsinkErator Badger 5.

If you need more power, 3/4 and 1 HP is typical choice of major customers, which normally cost above $100 to $300. You can find the most well-known branch in our website, Waste King, and InsinkErator. Waste King has Legend series, which is less expensive with standard qualities in both grinding power and noise reducing. While InsinkErator possesses well-developed technologies with exceptional standard qualities, and it also comes with affordable prices. Both branches have their strength on this market.