Review on AQUANEAT High-Capacity Aquarium Air Pump for tanks up to 300 gallons - Dual Outlet Oxygen Aerator Pump by Jillian Bishop

It comes with two outlets and two sets of 4 stainless steel valves. Probably can't power 8 Airstones unless they are small. I have a valve that feeds a 4 1/2" lighted round disc. The second outlet feeds two 2 1/2" round airstones. I had to use valves to soften the airflow as it carried my 110 gallons full air away. I use 3 out of 8 valves. Just close the ones you don't use. Another BIG plus is that you don't even hear it's on and running. it's so quiet Don't make my mistake and place it on the aquarium layer. It must be above the upper waterline. Before I knew it, the siphon was soaking my floor. Thank goodness I had a bucket nearby! I would buy again in a heartbeat. Let's hope this lasts.