Purchase and installation of Agilent helium conservation modules for EPA owned Agilent GCs. The helium conservation modules reduce helium consumption by enabling nitrogen standby and will replace exte... Purchase and installation of Agilent helium conservation modules for EPA owned Agilent GCs. The helium conservation modules reduce helium consumption by enabling nitrogen standby and will replace externally fabricated switching devices currently in use, improving safety, standardization, and operating efficiency.