For use with your aqusarium Air pump. The non return valve will allow air through in the direction of the aquarium but importantly won't let any air or water travel in the opposite direction. This is important incase of air pump failure as water from the aquarium could travel back through the tube causing a Flood
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Does it job, it works just fine and easy to cut in to the tubing, just get it the right way around! Teeny bit expensive here as postage is extra, it's available for 1/3rd of the price in shops.
Wanted to make small modification to my aquarium setup, and bought one of these just to ensure a bit more safety. Does what is supposed to without any problem. The delivery was prompt and fairly well packaged, Would definitely recommend to others.