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Old 11-01-2012, 07:05 PM   #1
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Sump pump: 1 1/2 connection to 1 1/4 PVC pipe

I have to replace my sump pump. I notice that it currently has a Wayne 1/2 hp sump pump. (it was professionally installed 10+ years ago, I think.) Anyway, I plan to buy another Wayne 1/2 hp sump pump and do it myself. But I noticed that the PVC discharge pipe that was installed is 1 1/4 inch pipe. Yet the pump connection I see advertised is 1 1/2 inch. I am going to have to buy check valve, too. but my question is: will this work with 1 1/4 inch pipe? I sure don't want to have to replace that pipe if necessary.

and how do I make it work? what parts do I need to buy?


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Old 11-01-2012, 07:12 PM   #2
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the connectors that come with most check valves will work with 1-1/4 or 1-1/2 pipe.


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Old 11-01-2012, 07:26 PM   #3
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so, I just put 1 1/2 inch pipe into the sump pump, run it up to the check valve and have 1 1/4 inch pipe coming out of the check valve? and that will work without any problem?????????
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Old 11-01-2012, 07:27 PM   #4
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To decrease or increase in size a swage is one of the best options for flow and it's too bad they aren't more readily available. They can be found if one knows where to look but in PVC is where it seems to be impossible.
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Old 11-01-2012, 07:44 PM   #5
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put a 1.5"x1.25" galvanized bushing in the pump outlet.
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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Old 04-23-2015, 10:22 PM   #6
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Or you can use a check valve that comes with 1 1/4" and 1 1/2" capability like dannyt said. The pump will discharge at the rate of the smallest pipe in the system and being you are at 1 1/4", will not hurt the pump in any way (the only sure way to burn a pump up is to "dead head" it, or run the pump and not allow it to move any water at all). That is why back in the day, we drilled an 1/8" hole in the pipe inches above the pumps so if there were to be a restriction of some sort, the pump was moving at least some water. If you are replacing the old pump with the same model pump, connections should match almost exactly. If not, a bushing at the pump, or the compatible check valve are very easy remedies.


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check valve , discharge pipe , sump pump

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