Predicted to enable mannosyl-oligosaccharide 1,2-alpha-mannosidase activity. Predicted to be involved in mannose trimming involved in glycoprotein ERAD pathway; positive regulation of retrograde protein transport, ER to cytosol; and trimming of terminal mannose on B branch. Predicted to be located in endoplasmic reticulum. Orthologous to human EDEM2 (ER degradation enhancing alpha-mannosidase like protein 2). [provided by Alliance of Genome Resources, Apr 2022]