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Old 08-29-2006, 07:18 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
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Join Date: Mar 2005
Location: metro NYC
Posts: 44,790
Water can't go in, unless air goes out. You have to complete the circle. If you do two side-by-side systems, one with check-valve heads, and one without, on similar terrain, and do a second winterizing on each, over the course of several seasons, that might accumulate some data.

Even on old systems, with brass spray heads, there didn't ever seem to be a case of freeze damage if the system was winterized.

It just seems to be a non-issue to me.
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