You can purchase an extension to take the Airity to 17.7 m and to 19.3m which retails at £299.
The parallel number 4 fits between the standard number 4 and the number 5 section which obviously makes the pole longer without having to add a section at the back end of the pole.
They are also very handy for deep pegs that don’t require a full top 5 kit.
The original package for the black Airity had the following:
4 match top 4’s
4 big bore power kits with number 3 sections
one super 4 section
one parallel number 4 section
reversible phex section and a Tournament holdall
Hope this helps mate.