I worry about glops of thicker material going down the drain. I have also had to take the trap out to save the errant small washer, toothpick or even Q-Tip that made it to the scupper to quick for my occupied hands. A discussion on another forum had some folks recommending these:
Hmmm, Commercial unit, $73.50 plus tax and shipping . . . . . Nahhhhh.
$15 at Lowe's and an old spaghetti sauce jar. If Red Green could only see me now.
Screws right into place and works great.