I can only assume these are decent, well working filters in perfect condition. The four that were sent to me barely managed to deliver. The first two were pressed together so tightly it was like conjoined twins separating. The second two (replacements sent by seller) looked like they would fall apart at the corners, but held together once fitted into the HVAC vent. I would recommend any reputable brand that you can buy at big stores for a few bucks more and know that they will retain their structural integrity long enough to get installed.
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
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
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
23 Review