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Explanation: Schuurmans Stekhoven says
druppelaars = drippers.
But I know that uin farming "nipples" are used for feeding sows and cows with fluid mush, so this may be more likely.
However "drippers" are used for watering fields. See: http://www.mfa.gov.il/mfa/go.asp?MFAH023t0
You will have to see from the context what fits.