Nalge Nunc Serum Vial Closures HDPE NALGENE. The blowout is performed by blowing dry air into the closure to create a vacuum which tightens the bell to seal it to the vial. The seal is made by inserting the upper half of the vial into the lower half of the closure a process that eliminates evaporation loss and contamination. The lower half of the vial has a full seal in preparation for inoculation with the serum or other blood component. The upper half of the vial has a filling guideline so the lab technician can determine if the proper amount of donor plasma is required for inoculation. After filling storage and sealing procedures the full-throw closure is easy to perform. To use insert the full-throw closure into the full-throw vial. A slight vacuum is created and the vial is complete except for the lower half which is open. Specifications for Nalge Nunc Serum Vial Closures HDPE NALGENE 342158-0025 : Color: Red NNI No.: 342158-0025 Unit: Case of 2000 (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Nalge Nunc 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 Nalge Nunc 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 Nalge Nunc Serum Vial Closures HDPE NALGENE 342158-0025/ 73520-096 we carry a full complement of Beakers Test Tubes Flasks & Accessories as well as other product offerings from Nalge Nunc. We also carry a full line of Nalge Nunc accessories to help meet your laboratory and scientific needs. For a complete selection of Nalge Nunc Beakers Test Tubes Flasks & Accessories please visit our Nalge Nunc 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. Nalge Nunc Serum Vial Closures HDPE NALGENE 342158-0025