Why does my bathtub gurgle when I flush?

The air in– bathtub is equipped with air vents that controls the amount of air that flows through the pipes. These vents can get closed trapping in the air within the piping system. The air inside the water causes gurgling in the bathtub.

When I flush my toilet my bathtub fills up?

If your toilets, kitchen sink and tub or shower are all backed up, you probably have a clogged sewer line. When you flush the toilet, water backs up into or comes up in the tub or shower. When your sewer line is clogged, the water can’t go down the drain.

Why does the water get sucked out of my toilet?

If the water level in the bowl drops too low, you’ll start to smell the sewer gas. If the vent is clogged, the system tries to grab or gurgle for air. For example, when water is running down a waste pipe behind the toilet, that water is grabbing for air, and it could suck water out of the toilet bowl.

Should P-trap be full of water?

Yes, that is the purpose of the trap. It prevents air from migrating from septic waste lines into the house. Not only is sewer gas repulsive to smell, but it often contains methane which is explosive. There should always be water in the “p” trap which blocks sewer gas and keeps the place from smelling!

Can a toilet flush without a tub trap?

FWIW, a toilet will often flush well without any vent…it’s just the other things on the line that may have problems. FWIW, almost EVERYTHING will drain better without a vent. The vent is to keep it from draining so good that it siphons the water out of the trap. I once had a customer who wanted me to connect his tub drain to the stack.

Why does my shower drain gurgle when I flush the toilet?

Since there is only a small amount of pressure created by the water in your p-trap, flushing your toilet can cause water to flow up and out of your shower drain and gurgle while it passes through water that is held in the p-trap. It’s the same as if you were to blow air through a pipe filled with water.

What happens when you flush the toilet and take a shower?

For example, if you flush the toilet and it goes down the same drain as the shower, it will be pulling air behind the water. If that air isn’t coming from a vent, then it will suck out the water in the shower or sink traps.

Why is water coming out of my Tub trap?

FWIW, almost EVERYTHING will drain better without a vent. The vent is to keep it from draining so good that it siphons the water out of the trap. I once had a customer who wanted me to connect his tub drain to the stack.

What happens when you flush a drain and it gurgles?

Let me try to illustrate what happens when your drains are gurgling. When you flush, water is displaced by air in your water pipes (water leaves and is replaced by air). This water needs to be replaced or else a vacuum will be created and water will not flow properly.

Why is water coming out of my shower trap?

If that air isn’t coming from a vent, then it will suck out the water in the shower or sink traps. One last possibility that comes to mind is a vent that is improperly slopped that has become blocked with moisture (effectively becoming a trap in the vent line).