Labconco Rubber Top F/600/900/1200/2000. The wide base will accommodate various tube diameters and will prevent the sample from slipping out of the tube. The flanged design provides for easy sampling from tubes flasks beakers vials and dishware. Heavy-duty chemical and break-resistant these rubber tops will serve a variety of laboratory needs including the storage or transportation of urine blood serum and other biological specimens. Excellent for preventing leaks from sample tubes into bottles or vials. The rubber top will allow an accurate volume reading when sample weights are known. Individual yellow rubber tops will not leak if stored in standard conditions. Individual yellow tops will break or leak if stored at elevated temperatures. A brown top denotes a heavy-duty rubber top. Heavy duty black rubber tops are not rated for vacuum and should not be used with double- walled round or oval-bottom fermenters. Specifications for Labconco Rubber Top F/600/900/1200/2000 7544400 : Description: RUBBER TOP F/600/900/1200/2000 (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Labconco products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Beakers Test Tubes Flasks & Accessories with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Labconco Beakers Test Tubes Flasks & Accessories. 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 Labconco Rubber Top F/600/900/1200/2000 7544400/ 74920-004 we carry a full complement of Beakers Test Tubes Flasks & Accessories as well as other product offerings from Labconco. We also carry a full line of Labconco accessories to help meet your laboratory and scientific needs. For a complete selection of Labconco Beakers Test Tubes Flasks & Accessories please visit our Labconco page. For more brand name Beakers Test Tubes Flasks & Accessories please visit our Beakers Test Tubes Flasks & Accessories store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Labconco Rubber Top F/600/900/1200/2000 7544400