These USA Lab Glass Stoppers are made of premium 3.3 borosilicate glass. These stoppers are designed to plug up the female ports of the spherical 35 and 50 joints.
The S50 Item fits on the top port of USA Labs 10L, 20L, 50L, and 100L glass reactors.
The S35 Item fits on the top port of USA Labs 5L glass reactors.
Height: 3.125 inches
Height: 2.25 inches