I did NOT use the brass fittings as they seemed loose and the gauge bottomed out against the housing. However, I used standard MPT couplers and put twice as much TFE on the gauge so even bottomed out it is oriented correctly and doesn't leak. Lots of good clean air flow now!
Filter under the sink Aquaphor Favorit ECO silver
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NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
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NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
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