Disposable Flexible Nozzle Extender. The accordion style flexible nozzle reaches from 7" to over 12" and is bendable to reach into difficult to reach spots. The end of the Flex-tube fits over the caulk tube and secures with a metal O-ring to seal the tube. The Flex-tube can then be stretched and bent to reach the difficult areas. Designed for use with standard 10 oz caulking, sealant and adhesive cartridges.