In addition to the p trap good floor drains will also have a trap primer.
Toilet floor drain trap.
The drain in the toilet bowl is basically a p trap.
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This device is also found on most sinks and all toilets.
Sometimes the screw off tops were chrome plated and left exposed in the tile floor so you could open the trap and clean it out.
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When water goes down the drain the water in the elbow flows down the pipe and is replaced by new water entering the drain.
The modern toilet works exactly on this s trap principle.
As water drains down the steep slope at the wye it can create a siphon effect such that water will be sucked out of the trap.
The p trap creates a water barrier that prevents odors from venting up the pipe into the restroom through the drain.
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And since the water in the toilet is dropping and gurgling it s likely that the problem is near that area.
If water on the floor needs to escape it can flow out of the trapped floor drain but the trap contains a mechanical seal which prevents sewer gas backups even if the floor drain trap is dry.
In line floor drain trap seal.
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The drain in the ceramic bowl is molded in the shape of an s trap.
Once you flush the toilet the siphoning action effectively sucks out all the waste.
And the empty trap will allow sewer gas to flow into your home.
In line floor drain trap seal.
Self sealing traps for floor drains.
If the problem just started it s probably a blocked drain or plumbing vent pipe that needs to be snaked out.