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Old 03-28-2012, 07:19 AM  
sisyphus
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Default vacum breaker info

Hello all, I just discovered that the outside spigots should all have vacum breakers to prevent backflow into the house water supply. at Homedepot, I saw some sillcocks which were about 8" inches or more with a round cap on top behind the shut off knob. can someone explain how this thing works? thanks



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Old 03-28-2012, 07:44 AM  
nealtw
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The cap on top is a valve held closed by water pressure and springs open when the tap is turned off. So in a vacumme this would suck air not water. The length is so the actual valve is inside the building so it dosn't freeze as long as the hose is desconnected.



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Old 03-28-2012, 09:39 AM  
sisyphus
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thanks, but where does the air come from? and if that's the case wouldn't the air get sucked into the pipe?

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Old 03-28-2012, 04:40 PM  
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Yes the air gets into the pipe from that valve on top. But the water won't get sucked from the hose.

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