I just recently purchased the Yong Heng compressor and the Toauto water/oil separator. To do a quick breakin run of the compressor I connected the hose and filter to the compressor (bypassing the water/oil separator) and ran it for several minutes. A few days later I opened the filter assembly and pulled out the white filter. What I found was rust. I unscrewed the hose from the black filter assembly and found the male connector all rusty. The white filter held enough moisture to cause this corrosion that quickly. So my concern is that all the hoses and fittings on the Toauto water/oil separator are corrosion prone steel; not stainless steel. This is a major safety concern. So does anyone know where to find all stainless replacement parts? And are they Metric, NPT or BSPT fittings? Totally confusing!