VWR Black Rubber Stoppers One-Hole 13-M291 Pack. Combining top-notch and uncompromising quality with an affordable price the VWR Black Rubber Stoppers One-Hole 13-M291/ 59581-549 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: This rubber stopper has a 1-hole for standard jars and flasks. It is made of natural rubber and is FDA compliant. Should a sharp turn be anticipated apply a drop of water or a suitable liquidizer to check the stopper before placing the container into service. There will be a 2- to 3-inch drop in the liquid inside the stopper. Pulling the stopper out using a jar wrench provides a new liquid level inside the stopper. If the stopper becomes cuffed or leaking the use of a jar wrench or the removal of the stopper with a nut be sufficient to extinguish the sample. A funnel is required to remove the stoppers and place it into the jar or flask. Specifications for VWR Black Rubber Stoppers One-Hole 13-M291 : Size: 13 Dia. of Top mm: 68 Dia. of Bottom mm: 58 Length mm: 25 No./lb (Approx.): 5 (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 One-Hole 13-M291/ 59581-549 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 One-Hole 13-M291 Pack