RIH Air Dryer System - 1/2" NPT Double Air Filters-5 Micron Particulate Filter& Air Pressure Regulator - Gauge(0-150 psi), Semi-Auto Drain, Poly Bowl,Bracket - 3 in 1 Two Unit (1/2" NPT): Amazon.com:
California Air Tools Air Compressor Air Regulator with 5 Micron Filter 3/8 NPT Automatic Drain 90998-01 - The Home Depot
5 Micron Compressed Air Filter / Dryer 1/2″ NPT 80 CFM Rating WNA 110FR – Walmec North America