[drmerdp]

The main regulator attached to the LP bottle has the following specs: (Pretty standard, right?)

• Output pressure: 300mm. WC (about 11.8 in. WC or 2.94 kPa)
• Capacity: 1.5kkg per hour (or 3.3 lbs per hr)
• 3/8" barbed fitting

Standard pressures though the use of barb fittings arent typical. NPT and flare fittings would be best.

LPG pressure range: 2.8 KPA ---3.8 KPA (Is this the allowable input pressure?)

Yes the numbers convert to 8.3-11.2 inHG

Pressure regulating valve closing pressure: 3.50KPA (Not sure what this means)

Im not sure either. 3.5 kpa is 10.3 inhg

• Pressure regulating valve output pressure: 0.03-1.56KPA (see note below)
• 3/8" barbed fitting

Note: I believe this is adjustable by turning the screw in the middle of the orange (LP ↔ NG) knob. AFAIK, it regulates the gaseous fuel flow rate sent to the carb, much like an A/F set screw for gasoline. Would this be the equivalent of a load block?

Definitely equivalent to a load block, similar to standby units that have a two position switch for NG or LPG fuel flow. In the case of a load lock for a typical tri fuel conversion the screw setting might be 6 turns out on propane, but 11 turns out on NG. With more fuel flow required when using natural gas.

I can’t tell from the angle of the photo is there is any adjustment built into the orange fuel selector.