• This rubber stopper is available as a solid, or with one hole.

    Top: 1.0" (25mm)
    Bottom: 3/4" (20mm)
    Length: 1" (25mm)
    Hole Diam.: 5mm
    Fits 24/40 ground glass openings.
Available Discounts
Rubber Stopper Discount
  • Purchase at least 12 and save 10%

Rubber Stopper, Size #4

  • NC-0959
Price: $0.80
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  • All of our black rubber stoppers are laboratory grade.
  • They are made of solid natural rubber that stays pliable over a long period of time.
  • Ideal for use with non-aggressive or concentrated solutions. Low sulfur content.
  • Withstands laboratory conditions without hardening.
  • Working temperatures from –25 to 70°C (–13 to 158°F).

See our Rubber Stopper Size Chart for top, bottom and length specs of our other stoppers.