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I'm looking for a practical efficient way to open and close a 1/4 inch gravity fed hose. Initially I was thinking of using a Solenoid, but can't find anything suitable. My second thought was using a servo and valve. I was also looking into some sort of piezo valve but they seem very specialized and expensive.

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    $\begingroup$ What's wrong with the obvious answer of just buying a off the shelf electrically-controlled valve? $\endgroup$ – Olin Lathrop Nov 21 '16 at 12:20
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How about using a Plastic Water Solenoid Valve - 12V - 1/2" Nominal coupled with 1/2" to 1/4" adapter. You could use simple arduino microcontoller to control the valve. Below are some example images of the hardware.

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  • $\begingroup$ need something more like this store.rainbird.com/… the one pictured is to large $\endgroup$ – user379468 Nov 20 '16 at 19:49
  • $\begingroup$ Looks like you have found what you want. That is great. I was giving you a suggestion one way to solve your problem. $\endgroup$ – Mahendra Gunawardena Nov 20 '16 at 22:04
  • $\begingroup$ Well that's a valve, but still looking for a way to make it a soleniod $\endgroup$ – user379468 Jan 4 '17 at 22:49
  • $\begingroup$ Well it is solenoid that opens and closes the valve. $\endgroup$ – Mahendra Gunawardena Jan 5 '17 at 0:07
  • $\begingroup$ Why re-invent the proverbial wheel? $\endgroup$ – DLS3141 Jan 19 '17 at 21:39

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