Review on HITOP Dual Outlet Aquarium Air Pump - Whisper Adjustable Fish Tank Aerator for 20 to 100 Gallon (2 outlets) - Quiet Oxygen Pump with Accessories by Maria Marshall

A worthy pump for the money. It's small, attractive and rather quiet. My only issue so far has been the dial on the back of the pump, which adjusts the amount of air going through it to control the flow of bubbles out of the air stone. It doesn't seem to work or even make much of a difference. I mistakenly bought a single port pump instead of a dual port model so I could keep my two 5 gallon DWC buckets vented. I had trouble finding "Ti" to separate two lines from one because they were sold out at every local pet store. So I bought this Hitop model. While it seems to work well, this wheel still bugs me. I will update with new questions. Oh yes, the other reviewers are right about the included tubes. It's garbage and completely useless. Too soft to mount on a pump as the fittings are slightly recessed and the hose lacks the rigidity to mount. It basically collapses on its own. I hope I haven't wasted my money but time will tell.