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    What People Are Saying

    Durable in heating
  • Murray
  • 10/04/2013
  • This high quality stopper withstood very high temperatures during heating in an Erlenmeyer flask. It didn't dry out or break down. It proved to be well suited for serious science purposes.
    awesome stopper
  • kevin
  • 08/09/2012
  • I used these to plug holes in glass blocks, I use the 2 holes for wires for halogen light sockets, not really a science project. They seem to be good quality

    reward points

    Rubber stopper, #3, 2-hole

    Item# CE-STOP03B

    $0.50 in_stock

    In Stock

    Product Overview
    These #3 rubber stoppers are 18-24 mm diameter with two 5 mm diameter holes.

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    Save big when you purchase at the quantity levels shown below!


    QUANTITY 1 - 2 3 - 9 10+
    PRICE $0.50 $0.45 $0.40
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    • Product Details

      Rubber stopper, #3, 2-hole

      These #3 rubber stoppers are 18-24 mm diameter with two 4 mm diameter holes. #3 rubber stoppers fit 50-100 ml HST Erlenmeyer flasks, liter soda bottles or extra large test tubes.

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