I tried this and it seems to work well on my tank.
You take a piece of water jug and cut it to size, then fold a couple of 90 degree angles on the ends and place it over the injector section. Very simple to do and reduced the noise level by about 50%. Below is a top down veiw of the skimmer and the piece of plastic that can be used.
You take a piece of water jug and cut it to size, then fold a couple of 90 degree angles on the ends and place it over the injector section. Very simple to do and reduced the noise level by about 50%. Below is a top down veiw of the skimmer and the piece of plastic that can be used.