A self-sealing, tamper-evident closure including a cap body and an integrally-formed gasket valve is provided for use on a container. The cap body includes a tab integrally molded onto a removable frangible portion which breaks away from the cap body and exposes a self-sealing, flexible gasket valve....http://www.google.es/patents/US6050435?utm_source=gb-gplus-sharePatente US6050435 - Closure with integral self-sealing silicone valve and method for making same
Closure with integral self-sealing silicone valve and method for making same
