Rubber Stoppers - Size 7 Solid
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Top Diameter: 37 mm
Bottom Diameter: 30 mm
Length: 25 mm
Approximate Number Per lb.: 11
Developed for demanding laboratory work. Soft, pliable, resilient, low in free sulfur, resistant to chemical attack. Made of black or blue rubber. Size numbers are molded into the top.
NOTE: Bottom of stopper diameter must be smaller than test tube diameter.