BackFlow Freeze Bags
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An insulated backflow bag wraps an above-grade assembly, a PVB, RP, or hose-bib vacuum breaker, to slow heat loss through winter. Sizes here run from a 7 in hose-bib pouch up to 24x24 and 34x24 bags in green or tan that cover a full PVB or RP body, from WinterWrap and DEK.
A bag lowers freeze risk but does not replace draining the assembly in a hard freeze. The exposed brass body and test cocks crack first. See the backflow buying guide to identify your PVB or RP assembly.