This is a pair of NOS High Pressure Nitrous Oxide Filters, 1/8 NPT X -4 AN. Fits inlet side of Powershot solenoid series (and other brands of Sportsman series); both nitrous and fuel solenoids. This fitting features an aircraft type stainless steel mesh filter element to keep contaminants from attacking the solenoid and plugging the jets. All new NOS kits include a filter------highly recommended by NOS. Slightly used; nice shape------------guaranteed 100% functional and leak free. Current PLEASE BUY WITH CONFIDENCE; MY FEEDBACK IS ALL FROM BUYERS! CHECK WHAT THEY SAY ABOUT MY SAME DAY SHIPPING WITH TRACKING!