This 4.1 gram 3/8" neck unthreaded nitrogen cartridge is filled with high-purity, beverage-grade N₂, ideal for creating that smooth, cascading effect in nitro cold brew, beer, and cocktails. Designed for use with compatible mini-keg and handheld nitro systems that accept threaded cartridges. Provides consistent pressure without carbonation, preserving flavor and mouthfeel. Size of this 4.1G Nitrogen Cartridge is very similar to 16 gram - Co2 cartridge Connection: threaded Use Cases: Nitro coffee, draft beer, wine, and craft cocktails Purity: Beverage-grade, contaminant-free Note: Only for use in systems specifically designed for unthreaded nitrogen cartridges.