Sometimes, the medical caregivers need to collect the patient’s clinic data by some respiratory devices, O2 & CO2 sampling cannula another name ETCO2 nasal cannula is one of those special respiratory products. It could be used to deliver the oxygen simultaneously monitoring the exhalation of the CO2 of the patients, to see if the patient is in a good condition or provide further information to the physician for a better analysis of the symptom. A luer lock & filter is optional. Product details O2 & CO2 Sampling Cannula Made of medical grade PVC, odorless Length: 2.1 meters With Luer lock or Luer slip Each packed with an instruction label in a plastic bag