Appleton® ALESKO epoxy sealing putty is a liquid epoxy sealing compound designed for use in sealing fittings installed in hazardous locations. The use of ALESKO in sealing fittings prevents the passage of gases, vapors or flames from one portion of conduit to another, thereby restricting any explosion to the sealed off enclosure. Sealing fittings are required in class I, zone 1 and 2 (division 1 and 2) locations within 18 in of enclosures containing apparatus that may arc, spark or have high temperatures.