Item is a used single stage regulator for nitrogen gas. Inlet is I believe 3/4 in, but may be 1 in, depending how you measure threads. Outlet is 1/2 in.
This dual body regulator allows you to serve CO2 at different pressures to two different kegs so you can adjust serving pressure for style of beer. Also great for force carbonating one beer while serving another. Check valves guard from beer going into regulator body.
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