The residual oil exist in exhaust air just 0.1～0.2ppm, the lif span of regular service is 4000-10000 hours,needs little maintenance
drain valve kit
2901074800，2901071200 ， 2901021900 ， 2901007300 ，2901074900 ，
2901084500 ，2901075000 ， 2906009600,2901030100, 2901030100
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