This is a perfect example of a product solution provided by Custom Rubber Corp. The customer originally tried a standard o-ring that could have been supplied by any number of distributors, but the seal didn't work.
Custom Rubber Corp.'s design and engineering staff were involved in producing a part that was based on an o-ring, but required an additional sealing membrane in the ID. The resulting seal solved the leak problem in a cost-effective and elegant way.
The rubber parts pictured are not in stock or for sale. These are examples of custom-manufactured products that illustrate Custom Rubber Corp.'s capabilities.