Review on AQQA Aquarium Air Pump: 5W Dual Outlet Oxygen Pump with 2 Air Stones - Adjustable Air Valve for Quiet Bubbler Pump - Suitable for Up to 160 Gallon Fish Tanks by Denise Diaz

I wanted this as a spare but heck the day after I got it I had to install a hospital tank and sponge filter. I only use one of the two outlets, but love the flow regulator on this thing. I was able to set it up in under a minute, adjust the flow as needed and it's been working great ever since! It also came with air hoses and two check valves! Super comfortable. He's currently using a sponge filter in a 5g bucket at very low power, although I feel like he can do a lot more! Unfortunately, it's quite noisy, but place it on a soft cloth to muffle the vibration. This thing saved a life! I hope to try dual valves soon but am definitely a fan of this pump.