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double diaphragm air pumps


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Can anyone recommend a good brand air operated diaphragm pump.

We are using it for ethanol transfer and will also be doing filtration.

We are considering a variable speed pump (0-30) gallons per minute.

We were told by one source that the best material we should be looking

at for the inner is a PTFE (Teflon) inner diaphragm. But another company

is recommending a "Yamata" pump but they make their inner diaphragm

from "Hytrel" (Carlson) We are also looking into Graco and Aro from another

source. Does anyone have any first hand knowlege of either of these brands

or can recommend a knowledgable source for more information on this subject.

Thanks kindly

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