Frost King 4 in. x 3 ft. Fiberglass Self-Sealing Pre-Slit Pipe Cover F18XAD - The Home Depot

The Thermwell Products Co., Inc. 4 in. x 3 ft. Fiberglass Self-Sealing Pre-Slit Pipe Cover can be used for pipes exiting furnaces and water heaters and fits 4 in. pipe. This pipe cover has a self-sealing
The Thermwell Products Co., Inc. 4 in. x 3 ft. Fiberglass Self-Sealing Pre-Slit Pipe Cover can be used for pipes exiting furnaces and water heaters and fits 4 in. pipe. This pipe cover has a self-sealing jacket and can be used for steam heat systems and next to water heaters. Product length is 36 in.
Frost King Pipe Insulation makes it easy. Made of closed cell polyethylene foam or rubber foam, Frost King Pipe Covers slip on quickly and easily. Frost King Pipe insulation will save you money on your energy bill year after year.

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Frost King 4 in. x 3 ft. Fiberglass Self-Sealing Pre-Slit Pipe Cover F18XAD - The Home Depot