... requires fitting, 2. compact and space-saving design This filter has four series,"*" stands for different classes, it is ... 01μm,bottom oil≤0.001ppm;class 1: active carbon filter,bottom oil≤0.003ppm;ModelAir dischargeAir Entrance & Exit DiameterSize ... indicatorL Remarks:1. The filter only equip with manual drain, if need other accessories like above table, need extra charges. compressed air filter