Nitrous Oxide System - NOS Hi-Flo In-Line Nitrous Filter -6 AN (15557NOS)Any nitrous system wouldn't be complete without a proper filtration system. Keeping contaminating particles out of the N20 solenoids and jets is vital to the integrity and longevity of the system. NOS Hi Flo In Line Nitrous Filters feature reusable 140 micron stainless steel mesh filter elements that are easily removable and even easier to clean. Constructed out of aircraft type aluminum, these filters are compact to save space and weight, but won't