IN-Sump Overflow Noise Reduction

[lotsofgallons]

what can i attach to the 1.5" pvc overflow drain outlets into my sump to reduce noise?

 

[lotsofgallons]

^^

 

[beatle]

You could try an ell, a length of 1.5" PVC and then a 1.5" to 3" tee at the end with one end pointing up and one down. Ideally the water would be halfway up the horizontal pipe. You can then cap the top of the tee and drill a hole in the cap to allow for just enough air to escape to avoid too much backpressure. It'll look somewhat like this, but with a cap at the top of the tee:

I switched to the Herbie method (do a search) after I found this to be unacceptable, but it was close.

 

[jdircksen]

I have the same setup as beatle. I have 1" drains which go into a 1"x1.5"x1.5" T. The bottom of the T is submerged and the top of the T has a 3" length of pipe and a cap. I use the Herbie method so there is no air in my pipe which means I don't need a hole in the top cap.

 

[beatle]

If you're using the Herbie method, you don't need the ell and the tee. I have both of my drains (primary and backup) underwater by several inches, never been quieter:

Note, unions are better if they're after your gate valve!