<a href=showthread.php?s=&postid=15312558#post15312558 target=_blank>Originally posted</a> by Bax
If you get back pressure, a good vent on a discharge line is a Y-Tee like one of these two picture here.
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My skimmer and all solid return lines drop into the sump out of these to reduce bubbles and alow the drians to vent. Right now I am using 7" socks (as things are still kind of new), but when using 4" socks, I use 4" well screen to hold the socks upright as I have tons of it lying around. When I remember to, I also zip tie the sock to the crook in the Y-Tee so the 4" pipe & socks stay up. But I like your hook thingy too!
I installed the Y-Tees at strategic places - oh my gosh, they are noisy! I heard this gushing sound, and thought I had some type of major leak... looked around the sump - saw nothing. Then placed my hand over the T...and all the noise went away... Bizarre. Not sure how I'm going to silence the noise while keeping the benefit of the Y-Tee. Maybe I'll (literally) "put a sock in it"
![Big grin :D :D](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png)
Maybe a piece of floss would do it...allow the vent to breath while silencing the waterfall...
LL