SEOH Glass Stopper 24/40 Penny Standard Joint

Ok stopper, not very heavy duty, rather light walled and will probably break pretty easily. Ok for non-active activities such as bottle stoppers.

its a light-weight stopper and is only good for uses such as stopping bottles or flasks of acids, etc... That is how I use it and it works well for this purpose.

I ordered 2 one was cracked. They were not the same as in the picture they had an hexagon top

Works as advertised

Good quality for the price. Smooth, clean ground glass and lightweight. Good addition to the laboratory for keeping solutions under wraps and for keeping condensers or other equipment sealed up during non-use.

Immediately upon receiving this I noticed just how thin the glass was but thought but thought that it may surprise me. It did not, I used this for about a week before it broke under a mild vacuum sending shards of glass into a flask. Luckily it was under vacuum and not pressure.