Thanks for all the input. I have tried to replicate the valved vent by drilling a larger hole then taping it closed and using a pin to slowly enlarge a hole in the tape. All it does is affect the height of the water in the overflow box but little to quiet the gurgling. I'm not sure using solid pipe or spaflex will help muffle noise as it seems to be the gurgling of air at the T that is then being amplified in the T itself and sounding loud if that makes sense. But I may give it a try.
dkcrx, it looks like you have your pipe at about a 45 degree angle. This is why I used flexible tube as I need to go to the opening in the stand that is in the middle but the overflow is on the side. So I may need to angle the pipe as well and then use a couple of 45 degree elbows to get into the stand and sump. Would you mind posting a picture of the your configuration at the sump as well?
But as I said, most of the noise seems to be the gurgling at the T where the air/water interface is fairly turbulent and alot of air is being sucked down into the plumbing.
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