Adjustable Vacuum Hose, available in 2 1/2" diameter in one (1) foot adjustable segments and is self-supporting by popping together up to three (one foot) sections and choosing the nozzle best suited for your application. It is easy to position a hood close to the work area to collect fumes, smoke and particles at the source. Adjustable vacuum hose is designed to slip into 3" ID diameter existing sheet metal duct or spiral pipe.Hose is self-supporting up to 3 feet so it stays where you put it.