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Wet Pipe Nitrogen Inerting Start-up Kit

  • For wet pipe fire sprinkler systems
  • Designed specifically for wet pipe nitrogen inerting (WPNI)
  • Rated up to 175 PSIG
  • Patent pending

This product is designed to allow controlled venting of trapped gases within a fire sprinkler system when the system is filled with water after wet pipe nitrogen inerting (WPNI) has been performed. The vent, located at the top of the system, automatically releases the gas when appropriate.


  • During the nitrogen inerting process, the vent remains closed to prevent waste of nitrogen gas used to displace oxygen, which causes corrosion
  • Releases excess gas from the fire sprinkler system; removing excess reduces chances of hydraulic problems and false alarms caused by trapped gas
  • Once 98% nitrogen concentration in piping is achieved for corrosion control, the vent continues to provide venting of trapped gas that may migrate through the system over time


  • Available in two models: EAAV-2N (no wiring) and EAAV-3N (with electronic monitoring connection)
  • Adjustable pressure regulator integrated on gas discharge piping assembly to prevent discharge during WPNI
  • Gas sample port provides location to verify nitrogen concentration of fire sprinkler system
  • Water indicator located inside sight glass is designed to be visible from the floor up to 30 feet below the vent to indicate if primary float valve has failed
  • Temperature range: 40-120 degrees F (4.5-49 degrees C)

Installation Notes

  • Model EAAV-3N requires a single contact rated 24V AC/DC @ 2A for electronic monitoring with an EOLR (end of line resistor), detailed in installation instructions
  • If a location for the vent isn’t provided on project design documents, vent can be installed at an accessible remote high point on the system where sight glass is visible from below