Will the stoppers fit all bottles?

It is impossible to have one stopper that will fit 100% of bottles. With the original tapered style the small o-ring fits very few bottles maybe some olive oil bottles. The middle o-ring fits almost all wine bottles and some with screw tops. The top o-ring fits some screw top bottles. The SS-9000 stainless cork will fit the majority of bottles and will have a tighter seal because in most bottles, 2 o-rings will seal and the o-rings are a different derometer of nitrile thus making them squishier (new technical term!).