MSW Windstream Twist Inflator Quick Fill A simple, reliable twist-to-inflate CO2 head. There's no spring inside, so you control airflow by turning the cartridge instead of pushing. Features Twist-to-inflate control, rotate the cartridge to regulate airflow CNC-machined 6061 aluminum head, green finish for easy visibility3/8" threaded compatibility, works with standard threaded cartridges Lightweight, about 17 grams20g CO2 cartridge included, kits available with one or two SPECIFICATIONSWeight17g | Msw | Windstream Twist Inflator 20 Kit With Two 20G Co2 Cartridges