Breathing cap
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The breathing mask is always leaking oil; how to fix it?
Remove the cap on top; there should be a wire mesh inside. Clean it thoroughly, and if there isn’t enough of it, you can use some of those household cleaning wire balls. It’s worth a try.
Choose a filter with a higher mesh count and make it multi-layered, while also raising the connecting pipe beneath the oil cap.
Line the inside of the hat with oil-absorbing felt
Full-density circulating air compressor; add more wire mesh inside the breathing cap
Kobe Steel compressors: increase the mesh count
Choose a filter with a higher mesh count and construct it in multiple layers
It’s obvious that it’s a Kobe Steel machine, right?