It will not leaking if you do correctly : watch    • How to install the 1080 faucet extend...  

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Master water-savers - the faucet aerators are one of the most environmentally friendly plumbing parts on the market. in fact, according to the epa, installing faucet aerators is the single most effective water-saving plumbing change you can make! diluting the water stream with air, significantly reduce the volume of water flowing. they do this while maintaining the feeling of a high-pressure flower.