Brilliant! A small brush that fits over the end of your cap and kills two birds with one stone: keeps your faucet clean, and keeps flies out! When the heat of summer comes around and old beer heats up in the metal interior of your faucet, flies start hovering around. And what is worse than getting a cup of beer full of flies? Protect your beer by having a faucet plug with brush that scrubs out the inside of your tap and keeps flies out!