Optrel 4088.430 - Swiss Air Main Filter - 20 units
Save some money with a bulk buy. 20 pieces of 4088.400. This is the main filter complete with a prefilter but a total of 20 sets. (20 main filters and 20 prefilters).
Please do not remove the elastic band from the o-ring until you intend to use the filter. The band is there to protect the o-ring from losing its grease.