I had the same problem as Mr Rob Gunther (12/3/17) although mine didn't break because I couldn't even put the lid on enough to tighten it. Not only is it longer, but the rubber seal around it is much larger. Definitely not an FX12M filter. Based on the many good reviews, I can only assume that this company sells a mix of parts, some of which fit and some don't. I am very annoyed because I bought the set in December but did not venture to install it until recently. I spend most of my time away from home where my reverse osmosis system is installed. I think I lost $43.
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 Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
π§ NANPU 1/2" NPT Compressed Air Filter Regulator Combo Piggyback with Auto Drain, 5 Micron Brass Element, Poly Bowl, Metal Bracket, and 0-150 psi Gauge
18 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