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I've always been curious as to how the tape can suck air (and dirt) when the valve is off.
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Yeah - seems like there's no place for the air to go, I'll put one in the main supply line near the shut off valve just to be on the safe side. The 1/2" ball valves at every row in each zone won't need to ever be shut off (guess I didn't really need to put them in there!)
This well is completly separate from the house well so I don't have to worry about back-siphon - wouldn't hurt a thing.
Thanks again, Steve
Jack