Brewly B1020 Regulator for CO2 with Pressure Release Valve (PRV) suitable for sodastream bottles (T21-4 coupling). We recommend the use of a one-way valve to prevent liquid in the regulator. Manometer 0-90 psi (0-6,2 bar).Inputs:- T21-4 (sodastream)Outputs:- 1/4" FFL female (fits 1/4" MFL male)- 7/16"