Double Swivel Elbow with Bronchoscopy Port 15MM OD, 22MM OD/15MM ID, REF 1996030. Airway connector.
The port may crack in the swivel elbow where the flip cap is inserted, and these cracks could possibly leak if they reach a significant size.
US Nationwide
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-0785-2020