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P trap vs S trap
Posted by: space-time
Date: August 16, 2020 10:01PM
OK, I understand that P traps is OK and S trap should be avoided, codes, etc.

I understand how an S trap can be siphoned and it will be empty. why that does not happen with a P trap as well? if there is enough pressure difference, can't a P-trap be siphoned?

second question: I did some work recently and I noticed that the connection between P trap and trap arm does not have a seal. Why? they give you a washer to put between drain and P trap, but no washer between P trap and arm.

Thanks

EDIT: example here, they show slip washers between tail pipe and P trap and between Arm and wall, but not between P trap and Arm

[www.youtube.com]



Edited 1 time(s). Last edit at 08/16/2020 10:04PM by space-time.
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Re: P trap vs S trap
Posted by: NewtonMP2100
Date: August 16, 2020 10:31PM
.....don't forget....love.....is the tender trap....



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I reject your reality and substitute my own!
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Re: P trap vs S trap
Posted by: MikeF
Date: August 16, 2020 11:37PM
There are plenty of answers to S trap vs P trap with a little googling.

The connection between the P trap and the arm generally has a beveled edge that is effectively compressed when tightened. The other connections use a straight pipe connection, hence the need for a compression gasket.
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Re: P trap vs S trap
Posted by: Carm
Date: August 16, 2020 11:47PM
Quote
MikeF
There are plenty of answers to S trap vs P trap with a little googling.

The connection between the P trap and the arm generally has a beveled edge that is effectively compressed when tightened. The other connections use a straight pipe connection, hence the need for a compression gasket.
This. It has a built in “gasket”

As for the P-trap not being siphoned, the simplest answer is that the water levels out in a p-trap to keep the water from going all out, even with a light pressure.



Edited 1 time(s). Last edit at 08/16/2020 11:59PM by Carm.
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