VWR Black Rubber Stoppers Two-Hole 135M292 Each. Combining top-notch and uncompromising quality with an affordable price the VWR Black Rubber Stoppers Two-Hole 135M292/ 59582-520 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: The PTFE stopper has two through holes in the front. Through holes in the back allow gases vacuums or liquids to vent. It is used for safety inert containers (e.g. gas cylinders) fume hoods fume cupboards fume hoods fume cupboard doors fume cupboard drawers medicine cabinets fume hoods water tanks etc. to vent or expel any hazardous or toxic vapors smoke or fume hoods. The PTFE stopper resists acids most solvents and is most commonly used with glass rarely bursting. It holds its shape when new and features a virtually unbreakable valve on the top allowing repeated venting or bursting. This stopper resists cracking or breaking when used with air and is excellent for use with hot and cold liquids including acid. Color coding on bottom of stoppers is perpendicular to the top of the stopper indicating the size of the stopper rather than the bottle neck. It is shipped flat and color-coded to easily identify the size. Specifications for VWR Black Rubber Stoppers Two-Hole 135M292 : Size: 131/2 Dia. of Top mm: 75 Dia. of Bottom mm: 62 Length mm: 35 No./lb. (Approx.): - (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Plasticoid products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Laboratory Consumables with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for VWR Laboratory Consumables. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the VWR Black Rubber Stoppers Two-Hole 135M292/ 59582-520 we carry a full complement of Laboratory Consumables as well as other product offerings from Plasticoid. We also carry a full line of VWR accessories to help meet your laboratory and scientific needs. For a complete selection of VWR Laboratory Consumables please visit our Plasticoid page. For more brand name Laboratory Consumables please visit our Laboratory Consumables store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. VWR Black Rubber Stoppers Two-Hole 135M292 Each