Anaerobic workstations providing excellent conditions for the processing, incubation and examination of samples without exposure to atmospheric oxygen. Capacities from 200 to over 1000 x 90mm Petri dishes, three sizes of airlock, single plate entry systems, anaerobic and catalyst monitoring systems. Patented oval and instant access ports and versions with a unique HEPA filtration system. Options of single gas (ANO2), dual gas (ANO2 and N2) and three gas (H2, CO2 and N2) systems.