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Your cart is empty. Pack of ten #4 stoppers made of long lasting neoprene rubber. Blue color. Each stopper features two holes measuring 5mm in diameter. Manufactured according to sizes recommended by ASTM standards. Each stopper measures 25mm in length, has a base diameter measuring 20mm, and a top diameter measuring 26mm. The neoprene rubber construction is suitable for use with petroleum products, minerals, oils and fats, as well as most inorganic acids and bases. Resistant to temperatures ranging from -40 to 130°C.
Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind.
Preston Henson
Reviewed in the United States on January 6, 2024
A pack of these rubber stoppers with 2 holes and a pack with 1 hole are really a beginners necessity to be as flexible as possible with apparatuses before you possibly have all the glassware needed for some creative set ups.
steven lebeuf guerin
Reviewed in the United States on March 2, 2023
Fit perfectly
Tom Jahn
Reviewed in the United States on October 20, 2023
I didn't order the exactly correct size for one hole to have a thermometer inserted, so I drilled the hole open to be wider, and used the other hole for the drainage tube as required by our experiment. These stoppers did the job well! I am very pleased with them, and have a few extras.
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