The photo shows an APL valve with a ribbed adjustment knob and a scale marked in cmH2O. Related A-Series catalog reference: 801-0631-00062-00 (APL valve). The manual separately lists 115-046756-00 for a quick-release APL valve. The attachment style and exact part number cannot be confirmed from this top view; these references are not asserted to be interchangeable. Source: Mindray A5 Operating Instructions, Appendix B.2-B.3, https://www.mindray.com/content/dam/xpace/en_us/service-and-support/training-and-education/resource--library/technical--documents/operators-manuals-2/A5-%28Canada%29.pdf
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Provide the machine model, assembly label and connection photos to confirm the exact part number, revision and supplied components.