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  • Solid Rubber Stoppers


    Standard Grade Size No. 000 is 18 mm long; sizes No. 00 to No. 13 are 25 mm long. Sizes No. 13 1/2, 14 and 15 are 35 mm, 36 mm and 39 mm respectively.

  • Solid Silicone Stoppers

    Free from volatiles or extractable substances which may impair cell growth; for use at temperatures from -80 to 450°F Can be steam sterilized at 15 lbs. pressure, making them suitable for culture tubes containing pathogenic materials Length: 25 mm Not recommended for use with…

  • Two Hole Rubber Stoppers


    Standard Grade Sizes No. 00, 0 and 1 have holes 2, 3 and 4 mm diameter, respectively; all other sizes have holes 5 mm diameter

  • Neoprene Rubber Stoppers


    Solid green Neoprene Withstands exposure to temperatures up to  120°C Usable with petroleum products, vegetable and mineral oils and fats which deteriorate natural rubber Standard length: 26 mm Increased functionality over rubber stoppers at elevated temperatures. Not recommended for…

  • No 8 Stopper, Silicone

    DWK Life Sciences (Wheaton)

    Silcone rubber stopper Makes the connection to a standard 1 liter Erlenmeyer-style filtration flask Size: No. 8 Case of 6

  • Rubber Stoppers for 800mL Kjeldahl Flasks


    Choice of styles: solid or with one hole of proper size for 800mL Pyrex™ Kjeldahl flasks One-hole style can be enlarge or the solid stopper bored to take larger sizes Top diameter: 39mm; bottom diameter: 28mm; height: 35mm; one-hole bore diameter: 8mm

  • PYREX® Standard Taper Hollow Glass Stoppers


    The hollow stopper is light in weight, yet very strong to reduce chipping and breakage, thus minimizing replacement costs. A barrel-shaped head means it is easy to clean and even easier to rotate in or out. Grooves in the sides help prevent slippage. The flat top allows the stopper to stand on its…

  • XX2004718


    Designed for use with Millipore stainless steel vacuum filter holders Stopper Size: No. 8 Hole I.D.: 9.5mm (3/8 in.) Silicone rubber construction

  • Stopper Assortment


    Made of soft, pliable, black-compounded stock Length: 25 mm Includes stoppers of solid, one-hole and two-hole styles in sizes 00, 0, 1, 2, 3, 4, 5, 6, 6 1/2, 7 and 8; total of 66 stoppers

  • Rubber Stoppers

    United Scientific Supplies

    Rubber Stoppers packaged in convenient 1lb bags. Available in solid, 1 hole, and 2 hole versions.


    Saint Gobain

  • NMR Stoppers


    Hollow plug to fit inside bottles, flasks, vials, or tubing with a sleeve to pull over neck to create a double seal .Septa area allows insertion of needle, with excellent re-sealing properties for air sensitive chemistry Standard Compounds include Red and White Natural Rubber, Gray Butyl on…

  • Rubber Stoppers

    United Scientific Supplies

    Convenient assortments of various sizes of rubber stoppers in 1lb bags.

  • Gray Chlorobutyl Straight-Sided Stoppers

    DWK Life Sciences (Kimble)

    These high quality gray chlorobutyl stoppers are used for research and pharmaceutical packaging applications. Universal gray chlorobutyl formulation passes Japanese, European and United States pharmacopeia testing for globally marketed pharmaceutical products Formulation contains no…


    DWK Life Sciences (Wheaton)

    Septa for 20 mm screw caps or seals. Made of Polytetrafluoroethylene /Silicone Autoclavable

  • Tube, Test, Stoppered

    Ace Glass

    Test tube with interchangeable stopper; 24/40 stopper is hollow, other two solid.

  • Polyethylene Stoppers


    Inexpensive, tapered stopper provides for a tight, leak-proof fit while the top ring permits the stopper to be easily removed. Stoppers are made of yellow Polyethylene

  • Stopper No. 19 Cs 6

    DWK Life Sciences (Kimble)

    Replacement part for items that are ground to stopper dimensions. Yellow and blue stopper has a closed bottom. The enlarged flange is designed to protect the neck if the glass object is tipped over.

  • SYNTHWARE Septum Stoppers, Sleeve Type

    Kemtech America

    Flanged type stopper with a hollow plud and sleeve extension that folds down over the neck of vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, resealing after need is withdrawn.

  • Hollow with closed bottom Pennyhead Stoppers


    Hollow stopper with closed bottom

  • Assorted 1 Hole Rubber Stoppers

    GSC International, Inc.

    1 pound package of assorted 1 hole rubber stoppers. Sizes and quantities are as follows: Size 00: 4 each Size 0: 4 each Size 1: 4 each Size 2: 4 each Size 3: 4 each Size 4: 3 each Size 5: 3 each Size 6: 3 each Size 7: 3 each

  • KIMAX Brand Joint Stoppers

    DWK Life Sciences (Kimble)

    Borosilicate, with penny head Conforms to ASTM Standard E 675 Size Standard Taper 13 has solid plug; size Standard Taper 38 has recessed bottom Standard Taper designation indicates the approximate diameter of the ground zone at its widest (gauging) point.

  • Sani-Tech® Silicone Stoppers

    Saint Gobain

    Sani-Tech® ultra-pure platinum-cured silicone stoppers outperform standard neoprene and rubber stoppers in critical laboratory and process applications. These long-life silicone stoppers are fully autoclavable and sterilizable and will not crack, spallate or invoke particle migrations that can…

  • Assorted Solid Rubber Stoppers

    GSC International, Inc.

    1 pound pack of assorted solid rubber stoppers. Sizes and quantities are as follows: Size 00: 4 each Size 0: 4 each Size 1: 4 each Size 2: 3 each Size 3: 3 each Size 4: 3 each Size 5: 3 each Size 6: 3 each Size 7: 3 each

  • 45/50 PTFE Stopper, 3/4" NPT, Complete with Extraction Nut


    PTFE stopper adapter is similar to CG-3002-L but with the addition of one female NPT port in the center. The optional PTFE compression fittings provide a convenient way to insert probes or connect PFA tubing or FEP tubing to reactors or flasks. PTFE stopper has an extraction nut permitting easy…

  • PennyHead Glass Hollow Stoppers

    Across International

    Ai 24/40 pennyhead glass hollow stopper. Glass material: high borosilicate glass 3.3.

  • Stopper Size 19/38

    DWK Life Sciences (Kimble)

    Stoppers are used with laboratory glassware such as flasks and separatory funnels. Sizes Standard Taper 10/30 through Standard Taper 19/38 are solid Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements

  • Stopper Pressure Relief


    With a patented Glas-Col Snorkel Stopper, you'll never again have to take time to open the stopcock and relieve pressure when vigorously shaking a separatory funnel, because our Snorkel Stopper does the task automatically. If you use a Glas-Col shaker, you can simply load the funnels onto it…

  • Key-Head Color-Coded Medium Length PTFE Stoppers

    DWK Life Sciences (Kimble)

    Stoppers are used with laboratory glassware such as flasks and separatory funnels. PTFE has excellent chemical resistance and resists freezing in ground glass joints Remove the colored polyethylene handle from the PTFE stopper before cleaning or exposing to temperatures above 80 °C …

  • Poly-Cone Universal Joint Adapter

    Bel-Art - SP Scienceware

    This precision-engineered adapter may be cut with a fine-tooth saw or sharp knife into various adapters, such as individual bushings, stirrer bearings, thermometer and gas inlet tube supports, drip-tips, funnels, trap connectors for tubing, etc. Forms a continuous standard taper inside and…

  • Multifit Reusable Glass Syringes, Luer-Lok™


    Interchangeable plungers Luer-Lok™ tip Without needle Multifit interchangeability eliminates matching components after sterilization. Fine inference line on plunger for precise volume adjustments. Capacity and graduation interval are shown in listings. Zone 2 coded.

  • PYREX® Gas Washing Stopper with Extra Coarse Fritted Disc


    These PYREX® gas washing Standard Taper stoppers are replacements for the 500mL gas washing bottles (No. 31760-500EC). Sidearm tubulations are 8mm O.D. A 40/50 Standard Taper stopper is used to seal the top to the base. This Standard Taper stopper incorporates a tube with a 20mm diameter extra…

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