The regulator is the link between an RV's propane cylinders and its low-pressure appliance supply. A two-cylinder automatic changeover regulator has two inlet connections and a selection indicator; a conventional two-stage regulator may serve a different connection arrangement. Use this illustrated guide to recognize the main components and compare exact product numbers before replacing anything.
How a dual-cylinder automatic changeover regulator fits into the system
Each cylinder uses its own properly selected pigtail leading to a separate inlet on the changeover regulator. The regulator selects a service cylinder and has an outlet leading toward the RV's low-pressure distribution. The ACR-2 contains both the changeover mechanism and two-stage pressure regulation.
Selected service cylinder
Reserve cylinder
A two-stage regulator is not necessarily an automatic changeover model
A regulator such as the JR Products 07-30365 combines the first and second pressure-reduction stages into one body, but it is not a two-cylinder automatic changeover assembly. Its connection arrangement is also different from the Flame King ACR-2.
JR Products specifies a 1/4-inch female pipe-thread inlet, 3/8-inch female pipe-thread outlet and 225,000 BTU/hr capacity for 07-30365. Those details describe this exact part, not every two-stage regulator.
Compare the part number, port style and regulator role
| Model | Product type | Key identification point |
|---|---|---|
| Flame King ACR-2 | Two-stage auto-changeover | Two 1/4-in SAE inverted-flare inlets; 3/8-in female NPT outlet; 11-in WC factory setting |
| JR Products 07-30365 | Two-stage RV regulator | 1/4-in FPT inlet and 3/8-in FPT outlet, not a built-in dual-cylinder changeover |
| Camco 59002 | Automatic changeover regulator | Catalogued as horizontal mount; confirm manufacturer's full port and vent specifications |
| Camco 59005 | Automatic changeover regulator | Catalogued as vertical mount; do not infer identical mounting or fittings from 59002 |
| Flame King G2R150B | Two-stage RV regulator | A separate regulator model, not an ACR-2 changeover housing |
| Marshall Excelsior ME-KIT-1 | Pressure test equipment | Service equipment for evaluating pressure; not a replacement regulator |
Match the stamped part number, input and output fittings, regulator orientation and vehicle specifications. A similar housing shape is not proof of interchangeability. Specialized pressure, flow and leak testing belongs with a qualified propane service technician.
Compare exact regulator and service-tool product photos
These linked products are in the NewRVParts catalog. Open each product for its current availability and complete specifications; product images are provided for identification and are not universal fitment guides.
Follow the propane supply to the correct appliance parts diagram
The regulator is an upstream supply component. For an appliance fault or an internal gas-valve replacement, identify the appliance model and use its own parts breakdown rather than selecting a regulator by appliance name alone.
Manufacturer reference for exact connections
Flame King's ACR-2 product information documents its automatic changeover, inlet type, outlet type and regulator setting. JR Products publishes the 07-30365 specification for the different two-stage regulator arrangement. Use the correct model-specific installation instructions rather than this simplified component map to design or alter an LP-gas system.