It comes in different capacities according to the requirement.Stop-cock size also varies with the size of the burette.Function of the stopcock is to stop the flow of liquid filled in the burette.It is generally used in titration process.Straight bore glass key o-ring stopcock increases the life span of the stop-cock compared to other stop-cock.
This type of stop-cock enhances control and enables smoother action.O-ring in this Stop-cock provides leak –proof seal and it also softens the movement of turning on and off the stop-cock. Two of these are along the shaft of the plug and the third one is at the tip. O-ring makes stop-cock resistant to alcohols, acids, bases, oxidizing agents, oils, lubricants and many solvents.
