How To Plumb A Double Kitchen Sink With Disposal And Dishwasher

Even if you have enough money, you don’t require a professional for every tiny task. The installation of double basin sink in the kitchen is double kitchen sink plumbing. In comparison to single sink plumbing, the installation of a double kitchen sink is substantially more difficult. Despite the convenience of a double sink, installing one is not as simple, especially if you have no prior plumbing experience.

Double kitchen sinks are a dream for any home’s kitchen, yet the plumbing in a double kitchen sink might be problematic. If you need to install a double sink, you can either hire a professional plumber or install all the equipment and follow the steps below to do it yourself.

In our guide, you can learn more about double sink plumbing with garbage disposal. While using a double kitchen sink with garbage disposal plumbing diagram can be easier, you may not always get one.

Plumbing in a double kitchen sink

By the end, you’ll see what you need and what can happen with your drainage system when you learn how to plumb a double kitchen sink with disposal and dishwasher drainage in the same circuit. (Read Our Whirlpool Dishwasher Filter Cleaning Guide)

How Do You Plumb A Kitchen Sink With a Disposal And Dishwasher?

While adding a garbage disposal to a single bowl kitchen sink is more accessible than double sinks. You can still learn how to install a garbage disposal in a double sink.

Here’s how to deal with a single sink and more information before diving into the space beneath your double sink.

What You Need:

  • Wire nuts
  • Waste disposal unit
  • Hammer
  • Utility knife
  • Needle nose pliers with wire strippers
  • Screwdriver
  • Plumbers putty
  • Plastic putty knife
  • Non-contact electrical tester

Installation Steps for Double Kitchen Sink With Disposal And Dishwasher

The installation steps are:

  1. Clear the cupboard beneath your sink to make enough space for work.
  2. Next, switch off the circuit breaker to dispose of the unit’s wiring.
  3. Using a non-contact electric tester, make that electricity is not running through the cables for disposal.
  4. Using your pliers, undo the couplers and join the P-trap to the sink’s underside with the drain extension pipe. To prevent scents, block the drain with a rag.
  5. Remove the nut under the drain connection to separate the drain flange from the sink’s bottom using the pliers.
  6. Scrape the old plumber’s putty from the drain hole using a plastic putty knife.
  7. Smear putty around the flange of the garbage disposal appliance. Insert the flange into the sink’s bottom hole, then slide the gasket and backup ring to the flange open sleeve under the sink.
  8. After that, the mounting ring should be snapped on. Next, tighten the screws until the item fits snugly against the sink drain.
  9. Wipe away any excess putty.
  10. Ensure the dishwasher knockout plug on the disposal unit’s side is removed. Leave the plug in if you don’t have a dishwasher.
  11. Take six inches of electrical line from the wall switch and remove the disposal unit wiring compartment cover. Tighten the clamp with a screwdriver after inserting the cable into the wire clamp in the wiring compartment.
  12. Using the utility knife, remove the six inches of cable from the wiring chamber. Using the wire strippers, remove half an inch of insulation from the black and white wires.
  13. Connect the black cable wire to the black wire and the white cable wire to the white wire. After wrapping the naked wires around the unit’s green grounding screw, tighten it.
  14. After tucking all the cables into the wiring box, close it.
  15. After putting the disposal system on the mounting ring, spin the device to ensure the outlet faces the drainpipe.
  16. Ensure the disposal discharge is inside the disposal outlet before tightening the coupler.
  17. Remove the cloth you placed in the drain line before replacing the p-trap and extension pipe. Next, tighten the hose clamps with pliers or your screwdriver.
  18. Connect the drain line to the dishwasher knockout and tighten the drain coupling if you have a dishwasher.
  19. After resetting the circuit breakers, turn on the faucet above your sink. Next, switch on the disposal unit to check everything works.

Double kitchen sinks are growing more popular, but they are not straightforward to install. However, you will conserve space in your kitchen by installing double kitchen sinks. In addition, there are many advantages of using two sinks.

If you’ve ever wondered how to install a kitchen sink, we break it down step by step in the following section. (Read Can You Wash Dishes In Cold Water)

Check out how to plumb a double kitchen sink with disposal and dishwasher for more helpful information.

Garbage disposal installation without plumber

Does garbage disposal installation need a plumber?

Yes, in general. Garbage disposal units need electrical and mechanical connections, so it’s best left to a skilled plumber. However, the sink flange can sometimes be linked to the garbage disposal unit without the help of a plumber.

Will garbage disposal affect my dishwasher?

Food waste will be ground into tiny particles by garbage disposals. Your garbage disposal may alter how your dishwasher cleans your dishes, depending on the dishwasher you have.

You should not use your waste disposal to keep your dishwasher from overflowing. Allowing the water from your dishwasher to flow into the sink will cause an excess of food particles in the drain, clogging it.

Alternatively, you can use a larger diameter hose and a little ingenuity. The fundamental issue is that a dishwasher drain hose cannot fit through a kitchen sink drain because it is too narrow. This needs the use of a compression fitting or a hose connector with a big diameter.

How Do You Plumb A Double Kitchen Sink With A Garbage Disposal?

Planning can be a huge part of the installation process as you have more food scraps and dirty water in your system than before.
if you think you have clogs, a good dose of hot water can help free them, but it may be temporary before a flood from the disposal inlet.

Here is more about the steps and information you’ll need.

  • Purchase a suitable kit for your drain. The pattern may be central, and your drains are at the opposite end of your sink.
  • The second sink will hold your waste disposal unit, so supply lines need to match the ones that are in your drains.

Installing Water Supply Lines.

  1. Switch off the kitchen’s main water supply to install the supply lines. Installing with less or no water in the system is more manageable.
  2. Place a pot or a bucket beneath the drainage area, or lay down some tea towels to catch any water that may flow through.
  3. Remove your old supply lines with a wrench or lubricant if necessary. Then, install the new supply lines to replace the old ones with the wrench.

Plumbing Installation.

  1. Cut the pieces to fit beneath your sinks after dry-fitting them with a hacksaw. PVC pipes and the wall tube arrangement
  2. After installing the pipes and parts below the sink, insert the pipe nuts. Next, add a runner washer to the vertical pipe.
  3. Tighten the nut to make the pipe waterproof and unite the two pieces. Place the P trap on the pipes and press up to the sink.
  4. The wall-tube should be threaded into place, and the bolts holding the pipes to the sink should be tightened. Now turn on your water.

How to plumb a double sink with dishwasher and disposal?

What You Need:

  • Dishwasher installing kit.
  • 2 compression clamps.
  • A dishwasher wye.
  • Two rubber washers.
  • Needle-nose plier.

A disposal system is required to drain dirty dishwasher water and clean the dishwasher. Installing a double sink, disposal, and dishwasher in a kitchen might be difficult. It isn’t complicated, as the following procedure shows:

  1. First, turn the water source off to prevent water flooding from the kitchen sink.
  2. Make a hole in your double sink kitchen using a drill. The air gap stem should fit into the hole, therefore measure its diameter.
  3. You must pass the air gap with a rubber washer through the hole in the sink to install it.
  4. On your air gap system, place the 2nd rubber washer to ensure the air gap is watertight.
  5. To ensure it is tight as you fasten the compressor nuts, hold the air gap nozzle using your pliers and tighten the compression nut beneath the sink using a wrench.

Installing Disposal Pipe

Installing Disposal Pipe

The dishwasher disposal pipe should be routed through the set-up minor air gap fitting. You’ll need compression nuts or a suitable water hose clamp for this. (Learn How To Use Dishwasher With Broken Soap Dispenser)

Make sure the nuts and clamps are secured. The disposal pipe should ensure dirty water always reaches the air stem and discharge pile.

The air gap and the double kitchen sink are connected.

The distance between the air gap stem’s second outlet and the kitchen sink drain pipe should be measured.

Use a larger disposal hose than the measurement to keep the flexibility. Cut the disposal pipe to suit the fitting and connect one end to the air system’s second output.

Adding Your Dishwasher Wye

Measure the wye’s length. Then, cut the pipe that will join in the right place. To properly set up the why, make sure the vertical nozzle faces upward and the dishwasher angled nozzle faces the wye.

  • Connect the wye to the sinking bridge with nuts and washers to provide a watertight connection.
  • Connect the wye to the other pipe end that comes out of the air stem hose nozzle.

Once you’ve connected the drainpipe to the wye, your kitchen double sink with disposal and dishwasher is complete. Next, turn on the water supply and see if everything you’ve done has worked and your one-inch hose clamp doesn’t leak.

Installation Steps

Before you begin the installation process of the kitchen sink with disposal, assemble the parts that came with the disposal and make sure they fit perfectly.

Apply suitable plumber putty to the flange. Gently press it into place until it is secure. Set the disposal on the collar to keep it from moving.

After stacking the backup flange, mounting ring, and fiber gasket, slide the disposal onto the bottom of the collar. Once the disposal is in place, install the snap ring and tighten the screws. Clean up any excess putty as well.

To obtain access to the electrical cord, remove the wire cover plate and connect it properly by matching the colors of the wires.

Reattach the plate once you’re finished.

To connect the drain, gently insert the gasket gently and join the discharge tube with a flange and bolt in the discharge outlet. To hang the garbage disposal, align the mounting ring with the three tabs. After that, use the wrench to secure the ridges to the tab.

Connect the drain line to the dishwasher. Make sure the discharged pile is oriented appropriately before connecting the drain pipes.

Can You Run Dishwasher And Garbage Disposal At Same Time?

Because the dishwasher and garbage disposal share the same drain pipe, you’ll have plumbing issues in the kitchen if you don’t ensure all the food from the waste disposal are clear before running the dishwasher. (Read Can I Run My Dishwasher If My Sink Is Clogged)

A waste disposal is optional when installing a new dishwasher and can be bypassed with special pipe accessories. However, to comply with municipal requirements, residents must incorporate an air gap in their new dishwasher installation.

Where Do You Put A Garbage Disposal In A Double Sink?

Know your garbage disposal’s parts before installing them. You wouldn’t understand otherwise. So, here are the steps:

  1. Plumber Putty: Apply plumber putty to the flange. Then lightly press to keep everything in place. You can use this putty for many plumbing fixtures and prevent leaks.
  2. Flange Movement: Set your garbage disposal on the collar so the flange won’t move.
  3. Place In the Collar: Pile up your flange with a fiber gasket and mounting ring. Slide everything lightly to the underside of the collar and set it in position before fixing it.
  4. Use a Snap Ring: Install the snap ring and tighten the screws once you have it all in position.
  5. Electrical Cord: To access the electrical cord, remove your unit’s wire cover plate. Match the color of the wires and connect them right. Reattach the wire cover plate after the wire colors are connected. Ensure connection to the electrical outlet is off as you wire up your waste disposal.
  6. Drain Plug: Remove the drain plug with a hammer.
  7. Discharge Outlet: On your discharge outlet, insert a gasket by gently pushing it to the drain. Ensure you attach the discharge tube using bolts and the flange.
  8. Mount Ring: Align your mounting ring with three tabs and lock tabs using your hex wrench.
  9. Dishwasher Connection: Connect dishwasher drain and discharge pipe.

How To Plumb A Double Kitchen Sink With Disposal And Dishwasher

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