Micro Matic Primary Add-On Co2 Regulator (60 PSI) - Premium Plus Series
From their Premium Plus Series, this Micro Matic Primary Add-On Co2 Regulator has a 60 PSI gauge. There are a CGA320 inlet and a CGA320 connection on the Chrome-Plated Brass body.
This CO2 add-on regulator allows you to convert your primary regulator into a dual product. Use the integrated PRV to release excess CO2 manually, and it is equipped with a safety system 'shut down' (blow off at 55 to 65 PSI).
Micro Matic warns that - "This add-on regulator must be connected to a primary CO2 regulator. The threaded high-pressure port on the left-hand side is designed for a tank mount (primary) regulator. Not connecting a regulator to this exposed port will allow high-pressure CO2 to vent straight through the regulator body."