SHS Air Nozzle O-Ring - An often overlooked aspect of gear box maintenance, the o-ring inside your nozzle can wear out or may not be a perfect match for your cylinder head.  These little o-rings are perfect upgrades / replacements for nozzles that already have o-rings.  Stop beating your head against the wall wondering why your 120 spring is only resulting in 330 FPS, and get one of these today!