1/2" Air Pressure Regulator & Filter Combo with Gauge & Auto Float Dra – compressor-source
Amazon.com: Compressed Air Pressure Reducing Valve, Large Diameter Aluminum Alloy HNBR SMC Type Compact Air Pressure Regulator for Sophisticated Filters (AR925 20G with Gauge) : Everything Else
SMC 1/2 AIR REGULATOR W/GAUGE AR40-N04E-Z – SWING TECHNOLOGY LLC
SMC AR111 Air Regulator with Pressure Gauge - JMW Enterprises