This is very similar to another sink stopper that has a bevelled grip under the top, instead of an uncomfortable edge. The difference may seem subtle to most people, but the lack of comfort and grip is very noticeable when you try to pull the stopper up from under the weight of a sink full of water.
(See the 1st picture for this stopper. See the 2nd picture for the better stopper.)
Rate and Review Lasco 39-9013 InSinkerator Disposal Replacement Plastic Stopper
The Lasco 39-9013 In Sinkerator Disposal Replacement Plastic Stopper DID NOT FIT My Disposal . I Specified Exactly What I Ask For (A WHIRLEWAY SINK STOPPER) Instead this Is For a Lasco & Its Much To Big.