This pressure regulator is used in beverage industry,with safety release vavle,it will release the gas when the pressure is more than 45psi, it will keep the regulator,gauges and personal safe. With screw (M18*1.25)on the back of the regulator ,for mounting the regulator on the device.  And there is a switch on the outlet connection, for shut off and open the gas supply.

SPEC of Co2 gas regulator

inlet connector: CGA-320

outlet connector:1/4" NPT

hose holder: 5/16" hose

high pressure gauge: 0-3000psi

low pressure gauge:0-60psi