Condensate to drain connection

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Ernest Le

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My contractor ran the HVAC condensate drain down from the attic but did not tie it into the sink drain. I bought a branch tailpiece but my current faucet drain pipe runs down too low and I can't get the branch positioned above the P trap. Do I have to replace the existing drain that came with my faucet with a shorter one?
 

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Reach4

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You can use a hacksaw. Yet that alone will not be enough.

Can you reverse the U of the trap to make the input lower than the output of the U? If not, you could replace the trap I think. It looks like you have a trap adapter at the wall. If that is the case, it would be easy to replace the trap with one that has a reversible J bend.

Another possibility is to put a hole in your tailpiece, and clamp on a drain saddle. Condensate drainage may be slow enough. https://www.appliedmembranes.com/me...dle_installation_instructions_for_home_ro.pdf I am not sure that is a good idea, but it would get the water routed. Would there be clogging due to the small diameter later? I don't know.
 
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Ernest Le

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Do you mean something like this? I would have to cut pretty high up. What is the lowest level for the branch that would be acceptable? Would that make the trap too deep? Thanks
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Yes, but you would need to bring the branch tailpiece extension down to the smooth part of the tailpiece.

Keep the yellow dimension under 4 inches.

Plumb Pak® 1-1/2" Brass Dishwasher Tailpiece with 7/8" Branch PP142CP seems to put the branch higher.

Oops.. that is a tailpiece rather than a tail piece extension.
 

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Ernest Le

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That would put the branch below the outlet. Wouldn't that be a problem since the connection from the condensate drain is always under water?
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Given the acidic nature of condensate I wouldn't use anything metal in the drainage connection...
Drainage from combustion, like a tankless water heater or a high efficiency furnace would be strongly acidic. From an AC evaporator such as an A-frame, I would not think you would have a corrosive acid.
 
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Ernest Le

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I replaced the tailpiece but the branch connects right where the nut used to be positioned
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If I connect the nut, then the trap doesn't quite reach the waste arm
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Should I look for an arm that extends further down, an extension to connect the existing arm and trap, or a deeper trap? I'm short on either end by about a half inch
 

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Reach4

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I replaced the tailpiece but the branch connects right where the nut used to be positioned
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If I connect the nut, then the trap doesn't quite reach the waste arm
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Should I look for an arm that extends further down or an extension to connect the existing arm and trap?
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