Add-a-Regulator to your existing Taprite CO2 regulators. Comes with the necessary left hand thread adapter to connect to an existing Primary Regulator. Ensure that your CO2 regulator uses Left Hand threads. Gas outlet is a 5/16" barb, suitable for 5/16" vinyl tubing or 1/4" vinyl tubing that is warmed before inserting onto the barb. Outlet pressure gauge measures 0-60psi.