This brass nipple has 1/4 inch Male NPTs on each end (right hand thread) and is 2 inches long. Use this to connect single product CO2 regulators together to create a daisy chain for as many regulators as you need. This allows you to pressurize different kegs to different pressures. going between different kegs. Don't forget to wrap teflon tape around each threaded end before attaching it to regulators.