The Ziss Premium air valve is made to a higher standard than any other valve on the market. I have since been switching out every air valve I use for these in our store and fish room. These control the flow of air from an air pump to your aquarium.
We recommend keeping these near the rim of your aquarium for easy access. Make sure you have clean cuts on your airline tubing for best fit. Check the connections periodically to make sure your airline tubing hasn't hardened and lost it's snug fit.