The Exo Terra Monsoon Nozzle Tool is used for replacing spray nozzles on the Exo Terra Monsoon RS400 Automatic Misting System. Assembly instructions: Turn to the left to loosen and remove the nozzle head. Turn to the left to loosen and remove the nozzle base. Push the nozzle tip out through the front of the nozzle head. Soak the nozzle head, nozzle base and nozzle tip in a 50/50 water-vinegar solution for 3 hours. Assemble the nozzle tip on the nozzle base. Carefully insert the assembly into the nozzle head and turn to the right to tighten. Replace the assembled nozzle head into the nozzle and turn right to tighten.