How to Remove Plastic Nut from Toilet Tank: A Step-By-Step Guide (2022)

There are times when you must detach plastic nuts from the toilet tank. Although it may appear simple, it doesn’t always work as anticipated. Most importantly, one incorrect step may be detrimental to the whole toilet tank. In this article, we’ll discuss various ways on how to remove plastic nut from toilet tank. Read on!

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How to Remove Plastic Nut from Toilet Tank: A Step-By-Step Guide (1)

First, shut off the water supply line via the fill valve and empty the water in the toilet tank by flushing it. Use an adjustable wrench or pliers to detach the small piece of plastic from the supply pipe. Find the plastic nut at the tank’s base, smear it using grease, and take it out using a hex wrench.

To facilitate detaching the plastic nut, ensure that your toilet tank is desiccated. Keep reading as we have given you a step-by-step guide on how to take off a plastic lock nut from your toilet tank.

How to Detach a Plastic Nut from the Water Tank: Steps to Take

You can detach the plastic nut on your toilet tank if you adhere to the correct steps. Plastic nuts grip the fill valve into position. This way, your tank and toilet function well. To detach the toilet tank’s plastic nut, you require a couple of items, such as:

  • Hex wrench
  • Pliers
  • Hose (For siphoning water if need be)
  • Adjustable wrench
  • Rag
  • Pail

When working with water, rags and pail are helpful. However, you risk getting wet during the process. Let’s look at the steps of how to remove plastic nut from toilet tank. Let’s jump right in!

Step 1: Switch Off Water Supply

Water streams from the plumbing system via the supply valve into the toilet tank. The supply valve comes with a float that increases as the water rises. The toilet tank ceases filling if it reaches the supply valve.

If you want to find the supply valve, trail the water supply line from the toilet tank’s base to where it’s attached to the supply valve on the wall. On the supply valve, turn off the water supply.

You may find it challenging to turn off the water using your hands as it’s typically tight. Therefore, utilize a pair of pliers.

Step 2: Empty the Tank

Flush the toilet many times to ensure the tank empties all the water. If you shut off the water supply, the water goes down without filling the toilet tank again. It can take 3 to 5 flushes or more for the water to drain completely.

Your hands may get damp if you leave a little water in the toilet tank. However, you can still perform repair work. If the water doesn’t drip after a while, use a rag to soak up the remaining water. Cover the tank’s base with a towel before working on it.

There are several other methods of emptying your toilet tank if you can’t drain it through flushing. They include:

Scooping Water

This method takes time. However, you can utilize a bowl or cup to scoop the water from your toilet tank. Switch off the water supply line before doing so.

Then, flush the toilet a couple of times to drain as much water as possible. This technique is helpful if the level of water in your toilet tank doesn’t subside.

Using a Wet/Desiccated Vacuum

If you don’t have the time to scoop the water, utilize a wet/dry vacuum to drain the water from your toilet tank. Adjust the vacuum to make it ideal for water use; it makes it safer to work with it. Use this method if the bowl is empty but the tank doesn’t go down.


Also, you can siphon the extra water from the tank if need be. Before you start, don a pair of gloves and grab a clean hose. Put a pail next to the toilet to empty the tank’s contents into it.

Use a Plunger

You can utilize a toilet plunger to drain your tank. To begin, switch off the water supply line and flush the toilet one or two times. After that, place your plunger directly above the hole at the toilet’s base and create a powerful suction.

Then, lift your plunger up and down more than ten times. It drives the water out of the toilet tank.

Step 3: Detach the Supply Hose

Is your toilet tank free of water now? If yes, loosen the plastic coupling attaching the water supply hose to the tank’s base.

You can put a rag below the toilet tank to absorb any water that may come out of the plastic coupling. This way, the toilet won’t get dirty.

Step 4: Detach the Plastic Lock Nut

After taking out the plastic coupling, you can now locate the plastic lock nut. It’s a big plastic nut located on top of where the plastic coupling was. To detach the plastic lock nut, turn it using a pair of pliers.

To detach the plastic nut from the toilet tank, you need to kneel down. You can use the rag you put beneath the toilet tank for knee support. It ensures your pants don’t get damp. You can also put on shorts during the procedure.

It can be challenging to perform this without an adjustable hand wrench or pliers. Also, it’s suggested that you use a spud wrench (a go-to device for dealing with hex nuts). At one end, a spud wrench has an adjustable ordinary box wrench that you can use to screw and unscrew nuts when connecting pipe fittings.

How to Remove Plastic Nut from Toilet Tank: A Step-By-Step Guide (2)


A toilet tank contains the water necessary to flush the toilet after every use. In most cases, it comprises a fill valve, overflow tube, flapper, and flush valve. The plastic nut is located below the toilet tank. It grips the whole apparatus against the toilet bowl.

You may need to detach the plastic nut because of numerous reasons, replacing a defective nut. Therefore, learning how to remove plastic nut from toilet tank is a great do-it-yourself project. It’s also simple as you don’t require any expert plumbing expertise.

Frequently Asked Questions (FAQs)

How do you Unscrew a Plastic Nut that won’t Bulge?

Whether you utilize a hammer or turn-screw, or a basin wrench, it’s easier to unscrew the nut by heating it first using a hairdryer. The heat makes the plastic soft, and the nut becomes sufficiently flexible and makes it easier to break free.

Also, spraying a bit of calcium dissolver on the nut helps unscrew it. However, you have to wait a couple of minutes before rotating or tapping.

How do you Unscrew a Nut under a Toilet Bowl?

Nuts and bolts don’t rust or loosen easily as they’re fabricated from plastic. To reveal the bolt head, open the cover at the rear of the toilet seat. Then, unscrew the bolt using a pair of pliers or a turn-screw as you grip the nut beneath with pliers.

How do you Loosen and Remove a Flush Valve Lock Nut?

If the nut is fixed tightly to the tank, you can loosen the flush valve from the nut if you twist the entire assembly. To unscrew and remove the flush valve lock nut, use an adjustable wrench or pliers to twist it counterclockwise, and then unscrew it.

Doing so loosens the nut, and you can remove it using your hands. Detaching the flush valve from the toilet tank is a breeze.

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