Strange that these filters leak completely and hold some water. The water entering them smells clean (it doesn't smell musty like someone used it and returned it). The current "date of manufacture" is printed on the label. I do not know. I'm in a love-hate relationship with the circle. Damn filters are too expensive, but it seems they should work in a small form factor.
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 FRL Air Filter Regulator Lubricator Combo With 0-150 Psi Gauge, 5 Micron Brass Element, Poly Bowl & Semi-Auto Drain - Metal Bracket Included
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NANPU 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
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