HomeParts & AccessoriesHardcast Flex Grip 550 Water-Based High-Velocity Duct Sealant 1 Gallon Hardcast Flex Grip 550 Water-Based High-Velocity Duct Sealant 1 Gallon$95.00 Hardcast Flex Grip 550 Water-Based High-Velocity Duct Sealant 1 Gallon quantity Buy now SKU: HFG550 Category: Parts & Accessories Product ID: 1833 Related products $39.95 K-Flex USA Closed Cell Foam Pipe Insulation Tape $59.95 Nu-Calgon Cal-Blue Plus Micro Gas Leak Detector 1 Quart (32 fl oz / 946ml) $109.00 Nu-Calgon Evaporators Pow’r-C Evaporator Coil Cleaner 1 Gallon 3.8 Liters