Before replacing a propane regulator on an RV, compare what is actually installed. A two-stage regulator, an automatic changeover body, a hose assembly and a regulator bracket can sit together in the same compartment, but they are different parts. This illustrated reference helps you identify the component by its label, fittings and part number, then compare listings from UsedRVParts.
Identify the regulator, the cylinder hoses and the outlet
A typical two-cylinder RV installation routes each cylinder to a dedicated inlet of an automatic changeover regulator. This reference drawing shows the functional arrangement, so you can recognize the main assembly without assuming a universal fitting or hose.
Service side
Reserve side
Describes pressure regulation through two stages. By itself, it does not mean the part switches between two cylinders.
Uses two cylinder inputs and selects a reserve source when the service side becomes empty. Identify the lever and status indicator.
Supports or supplies the regulator. A bracket, pigtail or pressure test kit is not a substitute for the regulator housing.
Common regulator numbers and what distinguishes them
| Model/part | Role | What to check |
|---|---|---|
| MEGR-253 / MEGR-253P | Marshall Excelsior two-stage automatic changeover | Manufacturer specifies two 1/4-inch female inverted-flare inlets and a 3/8-inch FNPT outlet. MEGR-253P is the packaged variant. |
| MEGR-253P-PT15 | Regulator and pigtail assembly | Catalogued as MEGR-253 with two 15-inch pigtail hoses. Do not confuse a complete kit with the regulator body alone. |
| Flame King ACR-2 | Two-stage automatic changeover regulator | Two 1/4-inch SAE inverted-flare inlets, 3/8-inch FNPT outlet, 11-inch WC factory setting. |
| JR Products 07-30365 | Two-stage regulator without automatic changeover | 1/4-inch FPT inlet and 3/8-inch FPT outlet; do not treat as a two-cylinder ACR body. |
| Camco 59002 / 59005 | Automatic changeover regulator options | Catalogued in horizontal and vertical mounting variants respectively. Compare original mounting and factory specifications. |
| MEGR-900 | Marshall Excelsior regulator bracket | Manufacturer identifies it as a compatible Z-mount bracket for MEGR-253. It is not a pressure regulating device. |
Capacity is model specific. For the standard MEGR-253, Marshall Excelsior lists 225,000 BTU/hr on the primary side and 150,000 BTU/hr on reserve under its published rating conditions. Those are not universal numbers for every changeover regulator.
Find the matching product photo and exact part listing
The following are existing UsedRVParts catalog listings. Some catalog items are new and others are used; consult the individual listing for its current condition and quantity. When local viewing is offered, it is by appointment in Kelowna.
For similar-looking pressure regulators, compare the casting markings, vent orientation and fittings in addition to the photograph. Product imagery can help with identification but does not establish compatibility.
Check manufacturer parts references before ordering
The Marshall Excelsior MEGR-253 model specifications identify the automatic changeover function, capacity and applicable brackets. Flame King documents its ACR-2 regulator connection details, while JR Products lists 07-30365 as a different two-stage regulator. For installation, changes or gas-pressure testing, use the full manufacturer manual and a qualified RV propane technician.