Extension nozzle for Exo Terra Monsoon RS400 Misting System Easy to install The Exo Terra Monsoon Nozzle Extension Kit contains one, easy-to-install nozzle that allows you to grow your existing terrarium setup or extend the system to multiple terrariums. Up to 4 nozzles can easily be added to one Exo Terra Monsoon RS400 misting System (for a total of 6 nozzles).