Product review (4 stars): Saves having to disassemble disposal if inadvertently something small is dropped in sink.
Pros: Keeps objects like utensils from falling into drain/garbage disposal but still allows small food particles and liquids to drain.
Can also be used to plug sink for dish washing and water accumulation.
Cons: Their is no detent to hold stopper in open position so you must just be a little careful to position it initially in the open position. Not a big deal.