Product review (1 stars): Does not drain water properly
The version of this "quiet collar" that I received with my Excel model is poorly engineered and does not drain water properly.  With the regular use of water, our kitchen sink would start to fill up.  At first I thought we had a clogged drain line.  Then, I removed the collar and, voila, the water drained just fine.

To those of you in the same boat (pardon the pun), be advised that Insinkerator is send me an "alternate" collar.  If you are having this same drainage problem, I advise you to contact the company. My guess is that the original collar, which was supposed to use a layer of water to muffle sound, was engineered poorly.