I replaced my sump pump a while back. I put a home depot check valve between pipes while doing it.
The sump pump works fine. Then I read the sump manual again, and it said I should drill a 1/8" hole on the pipe just above the sump connection, to prevent air lock. So I did it.
Now whenever the water level in the pit is lower than that hole, the hole is ejecting a strong stram of water, and noise is noticeable. Is it really necessary to have a hole there?
What is the air lock anyway? I can't find the denifinition from my DIY books.
YJ