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Author:
bernabeu (SC)
You have an unvented 's' trap assembly and (probably) a 'partial' stoppage.
You will need an AAV added after the trap
BUT
first try to clear the stoppage.
NO CHEMICALS
Try a plunger - fill the sink and get the water ROCKING with occasional FORCEFUL downward pushes.
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Edited 1 times.
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Author:
imcool (MI)
I will install ABS vent,
As all the sink drains and pipes are out and disassembled, there is no clog anywhere.
I am confused by when you said its an S trap I have, but it looks like P trap. Can you clear this confusion?
thanks
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Author:
hj (AZ)
You DO HAVE an "S" trap, and you also have a stoppage, or partial stoppage, which traps air in the inverted "U" section of the trap. Loosening the coupling allows the air to escape and allows the water to drain. The drain line is full of water, but will drain when water enters the pipe.
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Author:
bernabeu (SC)
an unvented 'p' trap IS an 's' trap
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
hj (AZ)
Which is why I said, "You DO have an 'S' trap.
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Author:
george 7941 (Canada)
I am having difficulty understanding why air in the trap, which affects pressures by at most 5in WC, prevents draining. When there is standing water in the sink, there is more than 5in WC of pressure forcing water into the drain pipe, so the water should still drain albeit more slowly because of the loss of 5in WC of pressure.
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Author:
packy (MA)
george.. i'm having trouble too.
if what our friend from SC says is happening then there are many thousands of the same type situation that wouldn't drain.
just so we don't look like fools, cut in an AAV.
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Author:
steve (CA)
Maybe the trapped air is not "in the trap", but trapped in the downstream piping BY the trap.
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Author:
george 7941 (Canada)
Even if there is air in the drain pipe downstream of the trap, the pressure from the standing water in the tailpiece and sink should force the air past any clog. even if slowly.
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Author:
george 7941 (Canada)
Ah! Lemon Plumber! I miss his posts.
In the linked thread, hj states that hydraulic principles hinder flow through double traps. I still don't get it.
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Author:
bernabeu (SC)
to quote hj:
You DO HAVE an "S" trap, and you also have a stoppage, or partial stoppage, which traps air in the inverted "U" section of the trap. Loosening the coupling allows the air to escape and allows the water to drain. The drain line is full of water, but will drain when water enters the pipe.
me: loosening the coupling serves the same purpose as a piped vent except allows sewer gass(es) to potentially enter the habited space
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
imcool (MI)
I will cut a new AAV into the kitchen sink drain to fix this issue.
- What is the best way to connect abs to copper drain? should I stick to that frenco or there is any better idea.
- I would like to know why there is no AAV vent below the washroom sink I have? the washroom sink works works great but its smaller size than 1 1/2 kitchen drain pipe.
Cheers
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Author:
steve (CA)
The shielded coupling(Fernco) is fine to use. The lack of a vent isn't preventing the drainage, there's a restriction in the drain pipe. The vent keeps the trap from siphoning, which would allow sewer gas to enter the structure.
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Author:
imcool (MI)
can someone please tell me, how do i connect copper pipe to abs without using Frenco?
I tried looking online for fitting for my copper pipe size and abs size but I didnt find any fitting for my copper pipe
copper drain pipe size is 1-1/4 Trade Size, 1.660 nom OD
ABS size is 1 1/2 inch.
Please share link for fitting
appreciate your help
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Author:
packy (MA)
you would have to solder some sort of threaded adapter onto the copper. then find a fitting to screw to it on one end and glue on the other. then you'd have to cut the plastic and glue a coupling in there.
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Author:
bsipps (PA)
1 1/2” sweat X male adapter
Then use 1 1/2” tubular piping, tubular tee air admittance valve then a tubular trap and continuous waste if needed
Or use a fernco, abs piping with a trap that has a union for easy removal of the trap
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Author:
imcool (MI)
is the copper pipe 1 1/2 or 1 1/4.
I am so confused,
the OD i measured with caliper and the OD of the copper pipe is 1.6 inches
chart says its 1 1/4 inches pipe
please help
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Author:
steve (CA)
Copper "pipe" is different than copper "tubing"(DWV, or type M,L or K). 1 1/2" copper tubing is 1 5/8" OD(1.625" ). You have 1 1/2" DWV copper tubing.
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Author:
packy (MA)
my friend from PA. tubular doesn't always fit inside a male adapter.
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Author:
bsipps (PA)
You're right packy, I should have said trap adapter or (desanco)
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Author:
sum (FL)
They do sell this whole contraption in one bag.
If OP knows how to solder I would cut the copper and solder on a brass trap adapter and plastic tubular the rest of the way.
Edited 1 times.
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