VWR Corks

VWR Corks. The stopcock is stamped "Manton Cork" to ensure proper sealing and identification. Stamped "Manton Cork" means that the product meets very stringent ISO standards and is of highest quality. The convenient two-leaf stopcock is stamped "Manton Cork" to clearly state the source of the product. Non-sterile: This product contains a chemical which when in contact with acids will cause the cork to expand and contract causing the sample to expand and collapse. To release the stopcock the oute