Rubber Stoppers - Size 7 Solid
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Top Diameter: 37 mm.
Bottom Diameter: 30 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. All stoppers are 25 mm long and accept 5 mm tubing. (See glass tubing.)
NOTE: Bottom of stopper diameter must be smaller than test tube diameter.