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I would be really interested to know what other detailed differences there are between the design with the stainless diaphragms and the rubber diaphragms.
Using a rubber diaphragm would eliminate the need to seal the cast iron unit and using a material such a Contiflex which is a Viton/Nylon mesh would produce Ethanol resistant parts.
The coating on the stainless diaphragms is also very thin and we are trying to use a vapour deposited material to control the thickness so we can make coated diaphragms and simplfy the rebuild process.
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