Ordered 3 pcs 2 of 3 units had issues with brass inserts on both inlet and outlet. I ended up having to use liquid teflon to stop the leaks. I have used both nylon and brass fittings and have not sealed either of them with conventional Teflon tape. I even tried dark gray very thick teflon tape and that didn't work either. I like the simple design of the filter housing. Another problem with one of the blocks was that water was constantly leaking from one of the safety caps. Upon further inspection I found a tiny pinhole where a small plug was screwed onto the exhaust port. I fixed it by tapping the raised bracket with a screw and threadlocker. After about the 5th connection, all in different ways, no more sealant came out. I've had it up and running for about 3 weeks now and haven't noticed any leaks. I changed the filter and used a screw top safety valve and had no problems. No leaks after reinstallation. The fasteners are made of plastic, so you will have to move around a little when maintaining them. Will be updated in the future if problems arise. I think if they remove the brass and just tap the plastic it would be better and maybe get 5 stars. From experience with other high-end devices, threaded plastic heads tend to seal much better. Also: I would buy 2 dual units if they were available at the time and use 4 filters. For $25 each, you can't beat it.
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
20 Review
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review
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
26 Review
Filter under the sink Aquaphor Favorit ECO silver
20 Review