Cleaves alpha 1,2-, alpha 1,3-, and alpha 1,6-linked mannose residues from glycoproteins (PubMed:2211613). Involved in the degradation of free oligosaccharides in the cytoplasm (By similarity). Hydrolysis of terminal, non-reducing alpha-D-mannose residues in alpha-D-mannosides. Widely expressed. Highest expression in testis, adrenal gland, and kidney. Belongs to the glycosyl hydrolase 38 family.