Ideal for your standard small air hose (the type you would normally use with an Airstone air pump). I've used mine with an Aqualifter to suck up water from a reservoir and funnel it into my 12 gallon nano reef for fresh water topping up. You get 2 in a pack. The airline is a bit tricky to fit into the device (which is good because you don't want it to slide out). The bracket's fixed clip holds tight to the wall of my tank. I really can't say anything negative about this product.
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