Prevent potentially harmful VOCs from being released into the air with this the two-stage high-efficiency combination filter. Extreme duty aluminum filter base screws into the ¾ inch (19 mm) bung on a 55-gallon drum. The proprietary polymer coalescer captures the residual liquid in the gas before it reaches the activated carbon, helping extend the life of the filter by 33% as compared to other carbon filters—less changes outs, saving time and money. The top activated carbon filter cartridge feat