APPROVED VENDOR Caulking Cord: Light Gray, 100 ft

These hybrid caulking cords press into gaps without the use of tools to seal out air and moisture. Also called thumb-grade caulk, they are long, flexible cords that uncoil from a liner where they can be cut to the length needed. They are often used for quick sealing needs in duct work or tube connections in HVAC and refrigeration applications.