I initially had the same problem as others with installing this filter. Finally, after searching, I found instructions on this product's webpage (2nd photo). I wish Kohler would provide similar instructions in the brochure that comes with the product so consumers don't have trouble mastering the first step. . As for the filter itself, I followed the instructions after installing it on the system. It says to run water through the filter for 5 minutes, which I did. A few days later we still saw particles floating in the water. I turned on the faucet for another 5 minutes and it still wasn't fully cleared. For this reason I am deducting 2 stars from the rating. A NOTICE. I have a K-200 system and it fits if you follow the instructions above.
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 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
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
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