The M-Pol II complex possesses alpha-1,6-mannosyltransferase activity and is probably involved in the elongation of the mannan backbone of N-linked glycans on cell wall and periplasmic proteins. Component of the M-Pol II complex. Cis-Golgi (PubMed:18184749). Recycles between endoplasmic reticulum and Golgi (By similarity). Belongs to the ANP1/MMN9/VAN1 family.