This versatile micro regulator can be used with soda bottles and 12/16g CO2 cartridge. Includes a low pressure gauge and an 8mm hose barb fitting to attach to the 8mm ID gas line. The maximum working pressure of the regulator is 30 psi, and the installation and operation method is simple. With 3/8in to TR21.4 adapter, excellent workmanship, good sealing performance, suitable for Sodastream. Made of high-quality copper, wear-resistant, with good stability and durability.