Micro Matic Premium Secondary CO2 Regulator (60 PSI) 
A single gauge secondary CO2 regulator from Micro Matic.
The gauge reads up to 60 PSI, and the regulator has a built in pressure relief set at 55 to 65 PSI.
It has a durable chrome plated brass body with a built in wall mounting bracket.
The inlet is a 3/8" OD barb, and the outlet is a 3/8" OD barbed shut-off valve.