How To Clear A 4 Inch Drain Pipe

How To Clear A 4 Inch Drain Pipe

If your sink is overflowing and your 4 inch drain pipe is blocked, don’t panic. There are a few things you can do in order to clear the drain.

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Supplies You Will Need

-Can of compressed air
-Sturdy plunger
-Tape measure
-Pipe cleaner
-Stainless steel snake
-Socket set
-Bar clamp
-Ruler or a straight edge
-Lug nut wrench
-Chisel or a pair of pincers
-Steel wool
-Cleaning brush

1. Turn off the main water supply to the house.

  1. Open the drain valve on the pipe that the water is draining from.
  2. Fit the socket onto the end of the drain pipe and loosen the lug nut with the wrench.
  3. Carefully pull the drain pipe out of the hole in the floor.
  4. Sand the end of the pipe where it sits on the floor to prevent future leaks.
  5. Fit the drain pipe into the hole in the floor and tighten the lug nut.
  6. Put the pipe back in the floor, making sure the pipe is flush with the floor.
  7. Close the drain valve.
  8. Turn on the water to the house and wait for the water to start draining from the drain.
    10. When the water is flowing freely, turn off the water and remove the drain pipe from the floor.
    11. Wash the floor and drain pipe with soap and water.

Steps to Take

  1. If you have a plunger, use it to suction onto the end of the pipe and push and pull the plunger up and down. This will dislodge any obstruction.

    2. If you don’t have a plunger, use a scoop or a bucket. Fill the bucket halfway with water and use the handle to lever the obstruction out. Be careful not to pour water down the drain.

    3. If the obstruction is a piece of metal, use a hacksaw or a knife to cut it free. Cut slowly and carefully, taking care not to damage the other pipes. If the obstruction is a rubber block, use a plunger or a bucket to dislodge it.

    4. If the obstruction is a piece of plastic, use a plunger or a bucket to dislodge it. Be careful not to slip and fall in the water.

What to Avoid

Before you start clearing the drain pipe, you should take some precautions to avoid any accidents.

– First, be sure to secure the area around the drain pipe with pieces of wood or metal so that you don’t fall and injure yourself.

– Second, clear the drain pipe of any objects that may be obstructing its flow.

– Finally, use a plunger to clear any objects that have gotten caught in the drain pipe.

When to Call a Plumber

If you know that there’s something blocking your 4 inch drainpipe, then you should call a plumber immediately. Blocked drains can quickly become full of sewage and other gross materials, leading to serious health and sanitation concerns. If the blockage is just superficial, then you may be able to clear it yourself with a plunger or some other manual tool. If the blockage is more significant, however, then you’ll need to call a professional plumber.

Additional Tips

Clearing a 4 inch drain pipe is easy if you know how. Follow these steps:

1. Turn off the water to the sink and the hot water heater.

  1. Open the faucet that feeds the drain.
  2. Grip the drain hose near the water valve and yank it out of the sink.
  3. If there’s a screen or strainer over the drain, lift it out of the way.
  4. Point the drain hose at a trash can and let the water run until the can is half-full.
  5. Stop the flow of water by closing the water valve.
  6. Reach down into the drain and grab the clogged material.
  7. Remove the clog by hand, using a plunger if necessary.
  8. Replace the drain hose, screen, and strainer.
    10. Turn on the water and test the drain by filling it with water and rinsing the sink.


  1. What is the difference between a 4 inch rubber drain pipe and a 6 inch drain pipe?

    A 6 inch drain pipe is wider and can accommodate more weight and water flow than a 4 inch drain pipe. A 4 inch drain pipe is the most common size and is the size of most household drain pipes.


If your 4 inch drain pipe is clogged, it is time to clear it. To clear the drain pipe, use a plunger to suction onto the drain pipe and push and pull the plunger until the clog is dislodged. use a bucket to catch the water that was forced out of the drain pipe.

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