I use these to drip acclimate and I also use them to adjust the flow of my ATO system. They work well and although I would like to fine tune the adjusting knob more I know that it's hard with something that small. A great product at a great price.
Great Little Valves By Travis on 5/7/12
Travis would recommend this product to a friend
These are good little ball valves, much better than the cheap green ones you find. I bought some for drip acclimating and they work perfectly.