I bought these to use in our RV. They are very easy to use in hard-to-reach places. RV forums are full of problems related to poor electrical connection with wire nuts.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
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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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