I did a quick google search and found this:
Borosil Brand Erlenmeyer flask 3000ml.This is a borosilicate (heat resistant) standard lab glass flask with white graduations. It is 13 high and conical with narrow mouth.
Neck OD 53mm
Flask OD 182mm
Graduation Range 1000-2500ml
graduation divisions 500ml
Our size 10 Rubber stopper fits this flask