Mill-Pac Black; high temperature sealant. Rated for 1050 degrees. 10.4 ounce tube. This product is used to seal the joints on direct vent flex pipe. It is not flexible and dries hard like cement. Typically, you see this flex pipe used on gas fireplaces, or it may be used as the inner liner on some brands of gas vent pipe.

NOTE: This product has no adhesive quality.