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no, brass is not a better choice. Stainless is probably your best alternative to plastic.
Copper is a primary alloying element in brass. Corrosion will release Cu ions into the water. While the ammount may be small, Copper and invertabrates dont mix so I would avoid brass.
FYI, I have had some very nice plastic needle valves on reactors. The SMC needle valves from US plastics have worked very well.
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