It takes one second and one hand to put two parts together including attaching the locking band! The wall bands are embedded in to the pipe itself, so no protrusions between one section and the next.

Component: 250mm Pipe
Brand: TWPro
Compatible Brand: TWPro, KW, KWPro
Type: Flue
Construction: Twin Wall
Number in Pack: 1
Material: Stainless Steel
MPN: Various
Country/Region of Manufacture: United Kingdom
Orientation: Vertical
Application: Stove
Item Width: 5 in
Colour: Stainless Steel