250ml borosilicate glass separatory funnel 3" diameter 10.5" height Fitted with 19/26 plastic stopper that is removed easily during lab work to release pressure within the funnel Ungraduated This 250ml separating funnel has a robust pear shaped body with a 3" diameter at its widest point. The item measures 10.5" in height when positioned upright and is designed with a glass stopcock that allows optimal control of flow when working with liquids in the lab. The interchangeable plastic 19/26 stopper fits 1" opening at the top of the funnel, and the spout measures 3" down from the stopcock. The spout has a 3/8" outer diameter and a 1/4" interior diameter. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.