Need stainless steel fittings for Toauto water/oil separator

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!
 
You're talking about the coalescing filter, right?

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I recently purchased one, too, but haven't been able to use it much as the outlet fitting leaks where the hose screws on. I removed that fitting from the filter, and screwed in a hose that had come with my compressor. I'm pretty sure it's an M10 (x1.0?). The ends of the supplied hoses that screw onto the filter inlet & outlet fittings, I believe are 1/8BSPP (sometimes written as G1/8, or 1/8BSP). All the fittings are straight-threaded, none are tapered (as NPT is).

I would like to replace the fittings as well, but rather than using an M10 x 1/8BSP male-male as Toauto did on the filter, then a 1/8BSP that screws into that, it would be cheaper and more reliable to get new hoses that already have the male M10 on the end (as my replacement hose does, but it's not SS, either). It may be convenient to leave the top (inlet) fitting a right-angle, but it depends on your mounting options.

OTOH, I haven't seen any HPA hoses for sale that already have a male M10 on one end. As many others have commented/complained, the availability of a standardized set of quality fittings on pre-made hoses is non-existent. It's likely that adapters will be needed somewhere. https://www.bestfittings.co.uk/ has a good selection, including adapters.
 
those type of filter/seperators are not made to live in moisture ..the fittings are metric so not readily available ... the best plan since most of them have endcaps designed to be hand tightened is 'remove' them after use and pull any cartridges out .. hand dry and let them sit open until your ready to use again ..lubing up all the orings with silicone oil will keep everything happy .. if the fittings you have are not deteriorated id just clean them up and oil them with sillycon and theyll be aight .. just keep your unit maintained religiously so no crud forms in it ...