DVST Mill-Pac Black High-Temperature Direct Vent Sealant, 1 Tube

The DVST is a 90 ml. tube of non-toxic Mill-Pack black sealant for direct-vent gas heaters. This organically bound sealant expands once applied, creating an air-tight seal.

Mill-Pac Black DVST is designed to help seal cracks in direct vent heaters, fireplaces, and vent systems. The sealant has a maximum operating temperature of up to 1050°F (565°C.)

This is a non-toxic and organic fireplace sealant that is used by industry-leading manufacturers as their sealant of choice.