Introduction: Porter's expertise in measuring and controlling gases in critical applications is what makes Porter Nitrous Oxide Sedation Systems perfect for your patients and your practice. Our conscious sedation delivery systems offer the highest levels of precision, patient comfort, system safety. The entire Porter Nitrous Oxide System, from the precision flow meter and the patented, failsafe Automatic Vacuum Switch, to the unique double mask scavenger, can enhance the patient experience while generating a dependable revenue stream for you.