No longer do you need 3 separate nozzles for 3 stages of nitrous! The NX Triple D nozzles allows you to run 3 stages of dry nitrous through a single nozzle. No Reversion Guaranteed!! This nozzles can also be used for water/methanol, so you can have nitrous and water/methanol in the same nozzle., , When used in a NX direct port system, they ensure consistent cylinder to cylinder distribution making them the preferred choice for high horsepower applications.