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
  • buy at least 12, save 10%
Cat No. - NC-0959
Price: $0.80
Style -  



  • All of our black rubber stoppers are laboratory grade.
  • They contain a high percentage of pure rubber and are resistant to chemical attack.
  • Stopper composition ensures resiliency and pliability over a long period.
  • Withstands laboratory conditions without hardening.
  • The upper working temperature is 212°F.

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