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I have been trying to get my hands on some pump dispensers from like 100 years ago. I am curious how they used to be made then. Obviously no plastic, but perhaps rubber was most likely used.
I know they had a leather flap that worked as the pump check valve... likely the same for gaskgets. It would have been tanned but not treated (rawhide?)
I'll obviously never use leather for any future products. I did have graphite in mind, but it's still on the drawing board (another project). Right now I think I will have to give up and rely on the food-grade spigots that are available on the market. I would honestly make them myself from scratch but the investment required is astronomical for me right now. Maybe in the future.