(EN) The invention relates to an air dryer cartridge (10) in particular for a compressed air treatment system of a commercial vehicle comprising a cartridge housing (14) having a closed housing cover (16) an inner housing (40) arranged in the cartridge housing (14) a desiccant (60) accommodated in a space between the cartridge housing (14) and the inner housing (40) a filter arrangement (44) arranged inside the cartridge housing (14) and positioned in the compressed air stream upstream of the desiccant (60) in relation to normal operation of the air dryer cartridge (10) and a bypass (48) for bypassing the filter device (44). A non-return valve (52) which blocks a compressed air stream in the direction towards the desiccant and allows a compressed air stream in the direction away from the desiccant is arranged in the bypass (48). Said non-return valve (52) is formed in one piece together with the inner housing (40).
