This item is a one piece item which can be cut to size and is used as an adjustable length by way of sliding inside previous section of vitreous. It is NOT telescopic. When installed, the length of the existing pipe (not supplied) can be extended by 50mm-250mm.
Stove pipe is generally used to connect from your stove or appliance to either flexible flue liner or Twin Wall insulated flue.
You will need to use an adaptor to connect your stove pipe to these systems: