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sump discharge neckdown


John Dirks Jr
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I thought this looked wrong. What say you? Are you aware of any manufacturer instructions or code language that supports it being wrong?

I'm thinking it would at least slow the rate of evacuation and maybe put some extra stress on the pump due to pressure caused by the restricted discharge line.

I seem to remember at least one sump pump manufacturer (Zoller?) used to say that you had to use a discharge line that was the same diameter as the tap on the pump. I don't have the reference handy, though.

- Jim in Oregon

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I'm thinking it would at least slow the rate of evacuation and maybe put some extra stress on the pump due to pressure caused by the restricted discharge line.

It'll definitely reduce volume but I think you'd find that the pump would draw more current if the discharge were unrestricted.

It'll work longer, not harder.

Positive displacement pumps excepted.

No matter what, it's just dumb, right?

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