An auto changeover regulator manages propane flow in an RV, and selecting one depends on whether you need a full kit with hoses or just the main unit. These products vary by their BTU capacity, mounting style, and inclusion of safety gauges. The main differences lie in their gas flow support and the convenience of their indicators.
Best overall: Flame King KT12ACR-2 is a reliable choice for most RVers because it includes the necessary pigtails and uses a standard two-stage design that maintains consistent pressure for your appliances.
Best for high-demand systems: Kosan 924N Regulator offers a high BTU capacity, making it a great pick if you run multiple heaters or large cooktops that require a steady, high-volume flow of propane.
Best for simple setups: Flame King ACR-2 is the right pick if you already have hoses and need a straightforward, UL-listed replacement that focuses purely on the automatic switching function.
This guide is for RV owners who want to understand which propane changeover regulator fits their specific dual-tank setup.
How We Picked
We compared 48 different Amazon listings to find the most dependable options for RV owners. Every product included here had to clearly state its BTU capacity, connection sizes, and specific features like automatic changeover functionality. We excluded any listings that lacked basic technical specifications or left the buyer guessing about compatibility with standard RV propane systems. Our goal was to highlight products that provide clear, reliable information so you can make an informed choice for your vehicle.
All 10 products side by side — scroll sideways to see every column.
| Top Pick | Best for Tank Status | Also Great | Best for High Capacity | Best for Limited Space | Best for Tank Monitoring | Best for Complete Kits | Best for Safety Features | Best for Regulator Heads | ||
| Preview |  |  |  |  |  |  |  |  |  |  |
|---|---|---|---|---|---|---|---|---|---|---|
| Product | Flame King KT12ACR-2 | Kosan 924N Regulator | Camco Double-Stage Regulator | Marshall Excelsior MEGR-253P | Fairview GR-9984 | JR Products 07-31525 | RV Propane Regulator Gauge | DYC RV Regulator | Suburban LP-R924 | Flame King ACR-2 |
| Brand | Flame King | Cavagna | Camco | AP Products | Fairview | JR Products | PYXGLAQ | DYC DAIYOKI | Suburban | Flame King |
| Best for | Best Overall | Best for Tank Status | Also Great | — | Best for High Capacity | Best for Limited Space | Best for Tank Monitoring | Best for Complete Kits | Best for Safety Features | Best for Regulator Heads |
| The listing says | Remove empty cylinder without interrupting supply Switches automatically to reserve tank | Automatically draws from reserve cylinder 2 stage regulator with L bracket | Remove empty cylinder without interrupting supply 1/4" SAE inverted flare, 3/8" NPT outlet | Two stage regulator Max inlet pressure 250 PSI | 345,000 BTU per hour capacity Set at 11" Water Column | Not stated | Solid brass construction, CSA certified Switches automatically to reserve tank | Automatic dual-tank changeover Indicator turns red when empty | Automatic switching for constant supply Top-visible refill indicator | Remove empty cylinder without interrupting supply Switches automatically to reserve tank |
| More information | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon | Price on Amazon |
1. Flame King (KT12ACR-2) 2-Stage Auto Changeover LP Propane Gas Regulator
Best for: RV owners needing a complete, ready-to-install regulator kit.
The Flame King KT12ACR-2 is a two-stage regulator that handles the switch from your primary to your reserve tank automatically. This design keeps your appliances running without any manual intervention, which is helpful when you’re boondocking. Because it includes two 12-inch pigtails, you have most of what you need to get the system hooked up right away.
This unit is factory set at 11 inches of water column, which is the standard pressure for most RV appliances. It pairs well with a 48-inch thermoplastic hose if you need to extend your reach. The double-stage design is critical here, as it maintains constant gas pressure even when your demand fluctuates or outside conditions change.
If you’re running a high-demand heating setup, check your total load first. This regulator is rated for 345,200 BTU. If your combined appliance draw exceeds this limit, you’ll experience pressure drops that cause burners to sputter or fail to ignite. For standard RV systems, however, the 1/4-inch SAE inverted flare inlets and 3/8-inch NPT female outlet ensure a secure fit. Always verify your specific connection sizes before starting, as mismatched threads are the most common cause of leaks during installation.
Pros
- Includes two 12-inch pigtails
- Automatic switching between tanks
- UL listed for safety
Cons
- Standard capacity only
2. Kosan 924N RV Propane Regulator
Best for: Users who need high BTU capacity for large appliances.
The Kosan 924N Regulator is built for those who use their RV appliances heavily. Its 160,000 BTU capacity ensures that even when you’re running a heater, water heater, and cooktop at the same time, the gas flow remains stable. The top-mounted indicator is easy to read at a glance, so you don’t have to guess when your primary tank is empty.
This unit comes with a pre-mounted L-bracket, which makes the installation process faster than models that require you to source your own mounting hardware. It handles a wide input range of 25-250 PSIG, delivering a steady 11″ WC pressure to your appliances.
If your setup uses only a single tank, this auto-changeover system is unnecessary. You should choose this model only if you maintain a dual-cylinder setup and require the ability to swap bottles without shutting down your gas flow. It’s a robust option for those who prioritize a continuous, worry-free fuel supply. This regulator isn’t for a small, minimalist camper where such high capacity would be redundant.
Pros
- High 160,000 BTU capacity for heavy use
- Easy-to-read top indicator
- Pre-mounted L-bracket included
Cons
- Overkill for small, single-tank setups
3. Camco Propane Double-Stage Auto-Changeover Regulator
Best for: Owners who prioritize reliable, proven switching mechanisms.
The Camco Double-Stage Regulator uses a double-stage design to keep gas pressure consistent, even when the temperature or demand changes. This is a common requirement for RVers who travel through different climates. It allows you to swap out an empty tank while the reserve tank keeps your appliances powered, ensuring your comfort is never interrupted.
The unit features standard 1/4-inch SAE inverted flare inlets and a 3/8-inch NPT female outlet, making it compatible with most existing RV propane lines. If your primary tank runs dry, the system automatically draws from the reserve. Note that the primary side handles 210,000 BTU/hr, while the reserve side is rated for 130,000 BTU/hr. Match your appliance load to these limits to avoid performance drops during high-demand periods.
It’s a straightforward, dependable choice, though it doesn’t include the extra monitoring gauges found on the RV Propane Regulator Gauge. This regulator isn’t for those who want a “do-it-all” kit with hoses and tools, as it’s sold as the regulator unit only. If you need a complete installation package, you must purchase compatible hoses separately.
Pros
- Consistent pressure regulation
- Standard connection sizes
- Reliable automatic changeover
Cons
- Hoses not included
4. AP Products Marshall Excelsior MEGR-253P Reg 2-Stage Auto Vert Packaged
The Marshall Excelsior MEGR-253P is a two-stage regulator engineered to manage inlet pressures reaching 250 PSI. Its construction features a raw zinc and powder coat finish, providing a necessary layer of protection against outdoor exposure.
This unit is specifically designed for vertical mounting configurations. If your RV’s current regulator is mounted vertically, this model serves as a direct, reliable replacement. However, don’t attempt to install this in a horizontal orientation, as the internal diaphragm and vent positioning are calibrated strictly for vertical flow.
A common error is assuming this purchase includes everything needed for a full installation. This is a standalone component. It lacks pigtails, mounting screws, and protective covers. If your existing hoses are cracked or your mounting hardware is rusted, you must source those parts separately before beginning the swap.
Use this regulator if you need a precise fit for an existing vertical bracket. If you’re looking for a comprehensive kit that includes hoses and fittings, you’ll be disappointed by this bare-bones package. Always verify your current inlet connection is a 1/4″ female inverted flare and your outlet is 3/8″ FNPT to ensure compatibility before finalizing your purchase.
5. Fairview GR-9984 High Capacity RV Camper LP Propane Automatic Changeover
Best for users seeking a heavy-duty regulator, the Fairview GR-9984 handles a massive 345,000 BTU per hour. This capacity supports multiple high-draw appliances simultaneously without pressure drops. It maintains the industry-standard 11-inch water column pressure required for most RV gas systems.
The automatic changeover feature ensures continuous operation by drawing from a reserve tank the moment your primary supply empties. If you rely on multiple heaters or a large stove, this regulator prevents the inconvenience of manual tank switching during cold nights.
You must source your own mounting screws, as the manufacturer doesn’t include them in the box. Using undersized or mismatched fasteners can lead to vibration damage during travel. Always confirm your mounting bracket hole diameter before purchasing hardware to ensure a secure, rattle-free fit.
Choose this model if your total appliance load exceeds the limits of standard, lower-output regulators. If your current setup uses only a single high-draw appliance, the extra capacity of the GR-9984 is unnecessary. Avoid this unit if you prefer a plug-and-play installation that includes every required mounting component.
Pros
- 345,000 BTU capacity
- Standard 11-inch water column pressure
- Reliable automatic changeover
Cons
- Mounting screws not included
6. JR Products 07-31525 Compact Low Pressure Two-Stage Automatic Changeover Regulator
Best for: RVers with very limited space for equipment.
The JR Products 07-31525 is a compact, automatic changeover regulator designed to provide consistent gas pressure. Its small footprint is ideal for tight storage compartments or cramped dual-tank setups where space is at a premium. It’s finished in a clean white, which blends well with many RV exteriors.
While it lacks the detailed feature lists of some larger models, it’s designed specifically for standard low-pressure RV systems. It’s smaller and less conspicuous than the Kosan 924N Regulator, making it a good fit for smaller travel trailers. This regulator isn’t for someone who needs high BTU output or advanced monitoring gauges, as it’s a basic, space-saving unit.
Pros
- Compact, space-saving design
- Two-stage automatic switching
- Clean, neutral finish
Cons
- Limited feature information
7. RV Propane Regulator Gauge
Best for: Those who want constant, easy tank monitoring.
The RV Propane Regulator Gauge is a comprehensive kit that includes stainless steel braided hoses with built-in, glow-in-the-dark gauges. Being able to see exactly how much gas is left in your tank without shaking it’s a major convenience for frequent travelers. The kit also includes a wrench and gas-rated tape, making the installation process much smoother for a first-time DIYer.
The regulator itself features automatic changeover and excess flow protection, which adds a layer of safety. It’s much more feature-rich than the basic Camco Double-Stage Regulator. This unit isn’t for someone who prefers a simple, gauge-free setup and wants to keep their propane system as basic as possible.
If your primary tank empties, the system automatically switches to the reserve. The indicator changes color to signal that the primary tank is depleted. This allows you to refill the empty tank without interrupting your propane supply.
Always verify your system compatibility before installation. The inlets require a standard SAE inverted flare, while the outlet uses a 3/8″ NPT female pipe thread. Using the included Teflon tape ensures a secure, leak-free connection.
Pros
- Includes gauges for monitoring
- Comes with hoses and tools
- Excess flow protection
Cons
- More parts to install
8. DYC RV 2-Stage Auto Changeover Propane Regulator with 12″ Pigtail
Best for: Buyers who want a complete, all-in-one package.
The DYC RV Regulator kit includes everything you need to upgrade your system: the regulator, 11.5-inch pigtail hoses, a mounting bracket, and a protective cover. The inclusion of a cover is a nice touch, as it helps protect the regulator from dust and debris while you’re on the road. The red indicator window is highly visible, making it simple to check your propane status.
With a 287,500 BTU rating, it provides plenty of power for furnaces, stoves, and water heaters. It’s a more complete bundle than the Flame King ACR-2, which requires you to buy hoses separately. This regulator isn’t for those who already have high-quality hoses and just need the regulator itself, as you would be paying for parts you don’t need.
If you’re installing this unit, always ensure the regulator vent faces downward. This positioning prevents water from pooling inside the mechanism and causing internal corrosion. You must leak-test every fitting after installation to ensure a secure seal. If you smell gas during your initial test, shut off the tanks immediately and tighten all connections before resuming.
Pros
- Includes pigtails and cover
- Easy-to-read indicator
- High BTU capacity
Cons
- Not for those with existing hoses
9. Suburban LP-R924 Automatic Changeover Regulator
Best for: Those looking for an exact OEM replacement.
The Suburban LP-R924 is designed to be a direct replacement for many RV propane systems. It includes an assembled mounting bracket and a vent cover, which helps satisfy requirements for safe installation. The high-temperature-resistant diaphragm is a key feature for those who travel in hot climates or use their RV appliances for long periods.
It provides a steady flow by switching to the reserve cylinder automatically. The indicator is visible through most standard propane covers, so you can check your gas levels without removing the lid. If the indicator shows red, your service cylinder is empty. You can then safely remove that tank for a refill while the reserve cylinder continues to power your appliances, thanks to the built-in back check valve.
It’s a more specialized replacement option compared to the versatile Fairview GR-9984. This regulator isn’t for someone who wants to upgrade to a higher BTU capacity, as it’s strictly rated for 160,000 BTU. If your total appliance load exceeds this limit, you must choose a higher-capacity model to prevent pressure drops.
Pros
- Includes vent cover and bracket
- High-temperature resistant diaphragm
- Easy installation
Cons
- Lower BTU capacity
10. Flame King (ACR-2) Without Pigtails 2-Stage Auto Changeover LP Propane
Best for: Users who only need the regulator head.
The Flame King ACR-2 is a regulator that handles automatic propane changeover through a multi-step pressure reduction process. Because it arrives without pigtails, it’s the correct choice if you already have functional hoses and only need to replace a faulty regulator. The unit is UL listed and rated for 345,200 BTU.
This regulator is factory set at 11 inches of water column, which keeps your appliances operating within their intended pressure range. It maintains constant gas pressure even when demand shifts. If you’re a first-time buyer without existing hoses or fittings, choose a full kit instead. Attempting to source your own connections can lead to errors, as NPT pigtails aren’t recommended for this specific model.
For safety, the manufacturer uses high-strength thread-locker on the adapter connections. If you find these fittings difficult to loosen during a future replacement, don’t force them with excessive torque, as this risks damaging the internal seals. Always pair this unit with 12 to 18-inch inverted flare pigtails or the 48-inch Thermo Plastic hose to ensure a leak-free seal.
Pros
- Simple, focused design
- UL listed
- Secure thread-locker on connections
Cons
- No pigtails included
How to Choose in Sixty Seconds
Compatibility and Connections
Before buying, check your current inlet and outlet sizes. Most RV regulators use a standard SAE inverted flare for the inlets and a 3/8-inch NPT female pipe thread for the outlet. If your existing hoses don’t match these, you’ll need adapters, which can complicate your installation. Always confirm the orientation of your current regulator, as some are designed for vertical mounting while others are horizontal. Using the wrong mount can cause the vent to point upward, which is a safety risk.
BTU Capacity Needs
Think about what appliances you run in your RV. If you have a large furnace, a cooktop, and a water heater running simultaneously, you need a regulator with a higher BTU rating, such as the 345,000 BTU models. If you only use your propane for a small stove or a heater occasionally, a lower-capacity model will work just fine. Don’t assume every regulator provides the same flow rate; checking the BTU capacity ensures your heaters and water heaters perform reliably.
Monitoring and Extras
Decide if you want a basic regulator or a complete kit. Kits that include pigtails, mounting brackets, and gauges are excellent for beginners or for those who want to replace their entire aging system at once. If you already have good-quality hoses, buying a “regulator only” model saves you from paying for parts you don’t need. Gauges are a popular add-on because they let you see when a tank is low without having to go outside and shake the cylinder. If you prefer to keep things simple and avoid extra parts that could potentially fail, stick to a basic, high-quality regulator head.
Frequently Asked Questions
Do I need to replace my pigtails when I change the regulator?
You should replace your pigtails when installing a new regulator to ensure system safety. Many kits include new hoses, but if you purchase a regulator-only model, you must inspect your existing hoses for brittleness. Replace them if they show any signs of cracking or damage.
What does the “two-stage” design mean for my RV?
A two-stage regulator is essential for maintaining steady gas pressure in your RV. It reduces high tank pressure to an intermediate level before lowering it to the 11 inches of water column required by your appliances. This process ensures consistent gas flow despite temperature changes or low tank levels.
Can I install an RV regulator myself?
You can install an RV regulator yourself if you are comfortable using basic hand tools and gas fittings. The process involves mounting the new unit and connecting the hoses using gas-rated Teflon tape. Always perform a leak test with soapy water on all connections to ensure the system is airtight.
Why does my indicator show red even when the tank is full?
If your indicator shows red with a full tank, the regulator may not have detected the pressure flow yet. Open the tank valve slowly and fully to initiate the flow. Ensure the changeover knob is pointed toward the tank you intend to use as your primary gas source.
Closing
The Flame King KT12ACR-2 remains the premier choice for most RV owners, offering a robust 345,200 BTU capacity and the convenience of included pigtails. If your priority is granular monitoring, the RV Propane Regulator Gauge kit provides integrated gauges to track fuel levels without manual shaking.
Before purchasing, verify your specific connection requirements. Most standard regulators use a common SAE inverted flare for the inlets and 3/8″ NPT female outlets. Avoid using NPT-threaded pigtails, as they aren’t recommended for these connections. Always ensure your chosen model is UL listed to guarantee it meets safety standards for gas pressure regulation.
When installing, mount the regulator with the vent facing downward to prevent moisture buildup. Use high-strength thread-locker on pigtail adapters to secure critical fittings against vibration. Finally, never skip a leak test on all connections after installation. A small oversight here can lead to dangerous gas escapes, so prioritize a thorough check before your first trip.
