Exo Terra is a top brnad in reptie accessories for the natural terrarium. Their products are based on years of field study, conservation work, discussions with breeders and reptile hobbyists worldwide. The Exo Terra Output Tube Extension Kit allow 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). This kit comes with one nozzle.