Product review (5 stars): I was very happy to find these on Amazon
I was very happy to find these on Amazon. The original baffle had become stiff and worn with age. We did not realize how much quieter the disposal should have been working until we replaced it with this. The small opening is what keeps the noise inside. It allows the water to cover the openings, silencing the grinding.  It also pretty much mandates that a spatula is needed to push the veggie scraps thru the collar, however.