kiwiharry:

Handsomedan:

 

@MikeB4

 

The Tupperware one we have looks like this: 

 

 

Effectively, what it appears to do is break the seal between the can and the lid, after you use it to break the seal, you use the end of it to "grab" the edge of the lid and pull it off the can. 

 

Pretty simple and effective. 

 

We have one similar to this. We purchased it at the Home Show about 15 years ago and it is still working like new.

Purchased a couple of similar "seal breakers" from AliEx a 3 years ago - still on the first one.

I did try a couple of locally purchased that claimed to do similar, but all they did was cut the can leaving a lethally sharp edge.