[the_blue_tuna]

Do you have these and if so are you happy with the way they work. Any problems that need to be dealt with or mods to make right up front.

[Reefland]

All of the ones I have used and put together were very simple and required very little tuning once installed. The key is making sure the pipe can pull enough air, I wouldn't bother with trying to put in any kind of valve to control the air flow.

Scott Z.

[RichardScottRice]

They work quite well at quieting down the overflow box. You do need to make sure they get enough air as Reefland indicated, however I have found that installing an adjustable valve in the standpipe cap gives you more control over the air flow and eliminates the "whistle" you get sometimes when you just put a hole in the cap.

[Bamm Bamm]

Originally Posted by RichardScottRice

They work quite well at quieting down the overflow box. You do need to make sure they get enough air as Reefland indicated, however I have found that installing an adjustable valve in the standpipe cap gives you more control over the air flow and eliminates the "whistle" you get sometimes when you just put a hole in the cap.

I ended up adding adjustable air valves to the durso I had without them and it helped alot when i was running them I'm going to be doing a different duro design shortly on my acrylic.