Micro Matic Premium Primary CO2 Regulator (60 PSI) 
A high quality Micro Matic primary CO2 regulator.
Has a gauge that reads up to 60 PSI, and a pressure relief that releases at 55 to 65 PSI. You can also manually relieve pressure.
It has a 3/8" OD barbed shut-off for an outlet, and a CGA320 inlet.
The body is chrome plated brass.