Abstract: A duct system component includes a hollow body, a generally tubular duct connection element that projects from the body and has an outer end. A band of integral continuous or intermittent outstanding formations extend about the tubular duct connection element at a position spaced from the outer end thereof, and from the body. The component further includes a strap apparatus retained or adapted to be retained in a closed transport condition on the connection element between the body and the band so that it cannot slip over the band. The strap apparatus is selectively adjustable from the transport condition to a loose fitting but closed condition for fitment over a duct into which the connection element is receivable, and then to a tight in-use condition in which the strap apparatus clamps the duct behind the band to retain the duct on the component.