This CO2 system (threaded) is perfect for a quick flat replacement. Reversible head for Presta & Schrader valves. Pressure release knob allows you to control airflow, so cartridge can be reserved and used as needed. 125 mm length/100 g, including cartridge. Water bottle cage-bolt mount included. One 16 g cartridge included. Compatible with 16 & 24 g threaded cartridges.