The function of SLC9A6 (solute carrier family 9 member A6, ENSG00000198689) is as follows. Endosomal Na(+), K(+)/H(+) antiporter (PubMed:15522866, PubMed:28635961, PubMed:31676550, PubMed:32277048). Mediates the electroneutral exchange of endosomal luminal H(+) for a cytosolic Na(+) or K(+). By facilitating proton efflux, SLC9A6 counteracts the acidity generated by vacuolar (V)-ATPase, thereby limiting luminal acidification. Responsible for alkalizing and maintaining the endosomal pH, and consequently in, e.g., endosome maturation and trafficking of recycling endosomal cargo (PubMed:15522866, PubMed:28635961, PubMed:31676550, PubMed:32277048). Plays a critical role during neurodevelopment by regulating synaptic development and plasticity (By similarity). Implicated in the maintenance of cell polarity in a manner that is dependent on its ability to modulate intravesicular pH (PubMed:20130086). Regulates intracellular pH in some specialized cells, osteoclasts and stereocilia where this transporter localizes to the plasma membrane (By similarity). {ECO:0000250|UniProtKB:A1L3P4, ECO:0000269|PubMed:15522866, ECO:0000269|PubMed:20130086, ECO:0000269|PubMed:28635961, ECO:0000269|PubMed:31676550, ECO:0000269|PubMed:32277048}.