I have one aquarium air pump with a very large connector and it came with an adapter/splitter that converts it to the smaller standard diameter, but I had to add an extra valve on each line. I was so happy to see this because it's exactly what I needed with built-in valves to control the air flow. The valves feel very snug, and I believe there is no air leakage. I like the bar adjustment vs. the round knurled adjustment knobs because looking at the angle you can kind of see how much airflow to expect, so it's great for realizing when your air stones are clogged. It's got a nice looking chrome finish with no visible defects, and I'm very happy with it, thanks a lot.