Quick Disconnect air rods are the go-to system for many duct cleaners. 5′ x 1/2″ OD Air Rods snap together using Quick Disconnect fittings. They are compatible with Viper, Scorpion, and other Quick Disconnect air rod systems. White stiff rods are more rigid than the blue. High flex rod can bend in a circle so its ends touch. Medium flex rod can almost bend in a circle and afterwards it will spring back to straight. The low flex rod doesn’t bend much and best used to push an attached agitation nozzle many feet down a horizontal duct or even straight up a vertical duct.Best used with compressors of 150 PSI or more. Colors may vary.