cp lab safety logo carbon filter, activated carbon with hdpe cartridge with flexible adapter, fits 1/2″ npt female threads. Single carbon filter with flexible black adapter fits the following port caps: wf-fs70-7, wf-70nal-7, wf-83b-10, wf-100-10. Order wf-cf-100-refill for a set of 5 replacement filters (without flexible adapter). includes the following parts: wf-cf-100: cp logo carbon filter, activated carbon with hdpe cartridge, with 1/4″ npt female port wf-flexi-12: black adjustable carbon filter adapter connects carbon filter to a 1/2″ npt female port, black acetal