Component of the type III secretion system (T3SS), also called injectisome, which is used to inject bacterial effector proteins into eukaryotic host cells (PubMed:24722491). Acts as a regulator of the SsaN/SctN2 ATPase activity (By similarity). The core secretion machinery of the T3SS is composed of approximately 20 different proteins, including cytoplasmic components, a base, an export apparatus and a needle (PubMed:30107569). This subunit is part of the cytosolic complex (PubMed:24722491). Interacts directly with SsaN/SctN2 (T3SS-2 ATPase) (PubMed:24722491). Detected in both the soluble and membrane fractions. Belongs to the SctL stator family.