Stoppers with Only One Number

As you can see from Fig. 18, that single number is the width of the stopper at its top. There is no mention of the length, and you can see that it is too short. The T19 stopper does not fit theT19/22 joint. Only the T19/22 stopper can fit the T19/22 joint. Single-number stoppers are commonly used with volumetric flasks. Again, they will leak or stick if you put them in a double-number joint. 

These pieces of jointware are the more common pieces that I ve seen used in the laboratory. You may or may not have all the pieces shown in Fig. 19. Nor will they necessarily be called EXACTLY by the names given here. The point is find out what each piece is, and make sure that it is in good condition before you sign your life away for it. 

Tales like these are commonplace, and ignorance is no excuse. Don t rely on expert testimony from the person at the next bench. He may be more confused than you are. And equipment that is slightly cracked is much like a person who is slightly dead. There is no in-between. If you are told that you must work with damaged equipment because there is no replacement available, you would do well to get it in writing. 

---

Stoppers With Only One Number Another Episode of Love of Laboratory Hall of Blunders and Things Not Quite Right... 

---