Modular Air Filter AF20 Series SMC's AF modular air filters are now easy to replace as the bowl and element are in one piece. The AF series is also more compact than the previous range. Improvements have also been made to the bowls with bowl guards now being transparent, users can monitor from any angle. Modular connection Polycarbonate bowl Note Transparent bowl is for body size 30 and over Filters, Lubricators and Separators High flow capacity filters, lubricators and separators with polycarbonate bowls. All have an ambient and media temperature range of 5 - 60°C and a proof pressure of 15 bar.