Should you install an automatic drain on the valve manifolds? And can you depend on this for "winterization"? I put automatic drains on all the lateral lines, but should you also install one on the valve manifold itself? Also along with this, can you depend on these drains for winterizing a system; I tell my customers to shut water supply off, drain line (PVB valve), and cycle controller thru cycle. Also, since I'm asking questions What all should you do, or tell your customers to do, when you get a cold snap? Around here, it's common to have a spell (1 day to 4 -5 days) when temps drop at night, say to around 20 - 25 deg. and warm up in the day - mid 30's. After this it may warm up again for a while. Thanks a bunch, perhaps this has been answered before, but I didn't see anything.