Kitchen drain line question


  #1  
Old 04-06-16, 06:25 PM
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Kitchen drain line question

I like to replace the 1 1/4'' drain pipe with 1 1/2'' ,the vent behind it is 1 1/2''
Is there a way to to do this without replacing the CI double Y?
Thank you
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  #2  
Old 04-06-16, 08:23 PM
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Assuming that the piping on the right side of the picture is the drain you wish to replace, the answer is no. You need to replace the double wye. The rule is that you cannot run a larger drainage pipe into a smaller fitting.
 
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Old 04-06-16, 09:03 PM
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I see I didn't phrase the question correctly

Is there a way to install a 1 1/2'' fitting without replacing the double Y ?
The drain is the pipe coming strait down, top of the DY
 
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Old 04-06-16, 09:22 PM
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Same answer, if the female threaded fitting in the cast is 1-1/4 you cannot use a 1-1/2 above it. AND if the outlet is still 1-1/2 you are completely out of luck.

Now I'm curious, the vent should be the center line, what is the line coming in from the side?
 
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Old 04-07-16, 11:03 AM
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Furd
I was wrong assuming the 1 1/4'' line coming strait down was the drain and the
1 1/2'' line on the right was the vent It is the other way around
Thank you for pointing out that the vent should come strait down
I'm changing and moving the kitchen sink 24'' and thought of replacing the existing copper drain line as I'm also upgrading the supply lines.
Not sure if the 1 1/2'' drain line will be enough if in the future a dishwasher [ City By Law does not allow garburators ] is conected to that drain
 
 

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