Coalescing pre-filters with automatic timed auto drain valves. Housings have internal corrosion resistant electroplating. Optional stainless steel housings are available. Particulate after filters to remove desiccant fines and contaminants. Activated carbon final filters remove trace odours/contaminants. Brass/Bronze pipe and fittings for all interconnecting inlet and outlet piping, copper purge air line with brass orifice union. Isolation valves allow removal of each dryer/filtration set from line service for maintenance while the other remains in service. Pneumatically controlled poppet-style inlet switching valves with 3 year warranty. PLC control with text display/keypad interface and password protection allows maximum user flexibility. ASME code compliant and CRN registered desiccant towers with stainless steel inlet and outlet retaining screens.