The function of SLC14A2 (solute carrier family 14 member 2, Ensembl gene identifier ENSG00000132874) is as follows. [Isoform 1]: Mediates the transport of urea driven by a concentration gradient across the cell membrane of the renal inner medullary collecting duct which is critical to the urinary concentrating mechanism. {ECO:0000269|PubMed:11502588, ECO:0000269|PubMed:17702749}. [Isoform 2]: Mediates the transport of urea driven by a concentration gradient across the cell membrane of the kidney inner medullary collecting duct which is critical to the urinary concentrating mechanism. {ECO:0000269|PubMed:8647271, ECO:0000269|PubMed:8997401}.