How do I choose and install regulators when installing 2psi natural gas lines?

When installing natural gas, I was under the impression that the appliances would hook directly to the gas lines at 2psi but the inspector said that they are rated in water columns – here is the tag from my dryer:

How do I choose and install regulators when installing 2psi natural gas lines?

Converting w.c. to psi shows that 4 w.c. is around 0.144 psi and 10.5 w.c. is around .379 psi so I suppose the appliance is not supposed to take 2psi directly or 55 w.c. – but I have never heard of putting regulators at all the appliance connections and the inspector did say it is a new thing.

I searched and it seems like this is the best regulator for the job, if I do in fact need one:

MAXITROL 1/2″ IPS NATURAL GAS REGULATOR MODEL325-3L

How do I choose and install regulators when installing 2psi natural gas lines?

I believe the “L” model is the vent-limiting model that can be used indoors and it has some blue paint to show the difference.

Specifications are as follows:

How do I choose and install regulators when installing 2psi natural gas lines?

Here is how I’m thinking about hooking it all up:

How do I choose and install regulators when installing 2psi natural gas lines?

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