VWR Corks. The molded porous surface of a cork absorbs moisture allowing it to remain liquid-tight for extended periods. In this way contaminated air or other contamination cannot contaminate the contents. Lightweight chemical-resistant and easy to open the Manton VWR Corks are excellent for use with all small scientific and medical tube racks and cylinders. Wide ranging applications of mammal and human tissue including bovine and rabbit tissue. Use as a cork for narrow opening cylinders for example to keep urine tubes from sloshing out into the atmosphere where sand or gravel may get caught between the cork and the edge of the bottle. The Manton VWR Corks will withstand boiling water for long periods reliably. Specifications for VWR Corks 50425 : Number: 4 DiameterTop mm: 16 DiameterBottom mm: 12 Lengthmm: 20 (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Manton Cork 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 Corks 50425/ 23420-151 we carry a full complement of Laboratory Consumables as well as other product offerings from Manton Cork. 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 Manton Cork 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 Corks 50425