Pure Gum Rubber Stoppers, Two-Hole
These highly resilient, pure gum, off-white rubber stoppers have less free sulfur (max. 0.25%) and are lower density than standard black rubber stoppers.
Made with two holes to facilitate laboratory usage. Rubber stoppers size 7 have 5mm diameter holes. Length: 25mm.
Top Diameter: 37 mm
Bottom Diameter: 30 mm