Abstract: A semi-rigid cover for insulating exposed plumbing structures, such as above ground backflow devices, against freezing when exposed to subfreezing temperatures. The device includes an insulative bag and a removable outer cover that is placed over the insulative bag. The insulative bag and outer cover are closed on three sides and open on a fourth. The device also includes a plurality of securing structures, such as grommets, to facilitate securing the device to the plumbing structure with padlocks, combination locks, zip ties and the like. The device further includes a sealing structure, such as a strip of hook and loop fastener, placed along the open edge to facilitate sealing the device about the plumbing structure to minimize drafts into the interior of the device and to exclude pests. The outer cover is replaceable separately from the insulative bag to reduce replacement costs in case of damage or loss.

Abstract: A semi-rigid cover for insulating exposed plumbing structures, such as above ground backflow devices, against freezing when exposed to subfreezing temperatures. The device includes an insulative bag and a removable outer cover that is placed over the insulative bag. The insulative bag and outer cover are closed on three sides and open on a fourth. The device also includes a plurality of securing structures, such as grommets, to facilitate securing the device to the plumbing structure with padlocks, combination locks, zip ties and the like. The device further includes a sealing structure, such as a strip of hook and loop fastener, placed along the open edge to facilitate sealing the device about the plumbing structure to minimize drafts into the interior of the device and to exclude pests. The outer cover is replaceable separately from the insulative bag to reduce replacement costs in case of damage or loss.