This document is a supplement to API [SPECIFICATION 19G2], 2nd edition (2020), the requirements of which are applicable with the exceptions specified in this document. This specification provides requirements for subsurface flow-control devices used in side-pocket mandrels intended for use in the worldwide petroleum and natural gas industry. This specification addresses injectionpressure- operated(IPO), production-pressure-operated (PPO), pilot, orifice, and dummy flow-control devices. This includes requirements for specifying, selecting, designing, manufacturing, quality control, testing, and preparation for the shipping of flow-control devices. Additionally, it includes information regarding performance testing and calibration requirements. The installation and retrieval of flow-control devices is outside the scope of this specification. Additionally, this specification is not applicable to flow-control devices with concentric axes. This specification does not include requirements for side-pocket mandrels, running, pulling, kick-over tools, or latches that may or may not be covered in other API documents. Reconditioning of used flow-control devices is outside the scope of this specification.