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According to the Gemara in Hullin on 107a, if there's a vessel with a hole in it, and there's a "stream" (more than a drip but not necessarily the "sheffoferet hannod" required for a real mikveh) connecting the water in the vessel to a kosher mikveh (i.e. a lake), you can dip your hands in the vessel and fulfill Tevilat Yadayim. My question is: can this work with a sink? It can be a great option when you're stuck without a cup available! you can stop the sink, fill it with water, leave the tap running and then dip your hands in it. There are two points I need to clarify for this to work:

A) Assuming the water comes from a reservoir, is a reservoir a kosher mikveh?

B) Is there a constant connection of water from the reservoir to the (cold water) tap, or is it broken at some point along the way?

Also, are there any other potential problems with this solution?

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If you assume the tap water is mikva water, than you could just wash your hands under the tap. Why do you need the kli and connection part? –  Double AA Feb 2 '12 at 6:00
    
You seem to be asking more about the mikva aspect. I recommend changing the question to just that and ignoring the netillat yadayim aspect for now. you will probably get more focused answers that way. just my thoughts. –  Double AA Feb 2 '12 at 6:02
    
it is dipping sideways into the downpouring stream –  Double AA Feb 2 '12 at 6:02
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Just to be clear I'm still a big fan of the mikva-pipes question :) –  Double AA Feb 2 '12 at 6:42
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Related: judaism.stackexchange.com/questions/6630, which question answers this question's point B as far as New York City goes, anyway. –  msh210 Feb 2 '12 at 16:34

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