Does anyone know where I could find these "sterile caps".  They are a #12 neoprene stopper with a flexible skirt that forms a cover which makes them far more secure than a regular stopper.  They used to be made by SEPCO (Scientific Equipment Products Co) in the USA.  The company seems to be long gone.  I use these to seal 20 liter carboy algal culture apparatus and have need of new ones; or something I can replace them with.  Any suggestions?

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