Sawada describes his method as packing "a lot of air between the grains." It's what helps create the divine melt-in-the-mouth feel.

After turning vane rotary flow off the air after oil, continue to up after packing, will the air filter layer of oil and other impurities again for the separation and filtering.

This kind of air compressor cylinder basically does not include any oil content in, the piston ring and packing is commonly ptfe.