How to soften rubber gasket for intake tube to throttle body

NJaykaplan

Registered
I have 2, my softer nicer looking one has a lot of holes in the side when closely inspected, and the one i have been using is hard from the heat. Going to use vaseline then clean it off and glue to the intake tube. Any suggestions would be helpful, as i dont know what else would recondition it since its not available new anymore.
 
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