The best propane changeover valve for an RV is a two-stage automatic regulator that matches the appliance demand and tank connections. The Flame King KT12ACR-2 is best for buyers who want 12-inch pigtails included; Fairview is a strong option for high-capacity, cold-weather demand; and RecPro includes QCC1 hoses. Compare connection types, rated capacity, and hose length before choosing a replacement.
| Product | Best suited for | Key detail |
|---|---|---|
| Flame King KT12ACR-2 | RV owners wanting included short pigtails | 345,200 BTU rating |
| Fairview GR-9984 | High-demand RV use | 345,000 BTU; 11-inch WC |
| Cavagna Kosan 924N | Lower-capacity dual-cylinder setups | 160,000 BTU; mounting bracket |
| RecPro RV regulator | Buyers seeking included QCC1 hoses | Red status window |
| Flame King KT18ACR-2 | Setups needing longer pigtails | Includes two 18-inch pigtails |
Flame King KT12ACR-2 With 12-Inch Pigtails
Best for: RV and trailer owners who need an automatic dual-tank regulator and want two 12-inch pigtails included. This option is selected because it combines automatic switching, a two-stage regulator, and the listed hoses in one package.
The regulator switches from the primary cylinder to the reserve cylinder when the primary is empty. The empty cylinder can then be removed for refill without interrupting the propane supply, according to the product details. Its capacity is rated at 345,200 BTU.
- 1/4-inch SAE inverted-flare inlets
- 3/8-inch NPT female pipe-thread outlet
- UL-listed regulator
- Two 12-inch pigtails included
Choose this model if its connection types and hose length match the existing installation. A limitation is that the included pigtails are 12 inches long, so buyers should check tank placement and routing before ordering.
Fairview GR-9984 High-Capacity Regulator
Best for: RV users who prioritize high stated capacity and cold-weather flow. The Fairview is selected for its 345,000 BTU-per-hour capacity and its listed two-stage regulation to 11 inches water column (WC).
This dual-tank regulator automatically changes from the service tank to the reserve tank. Fairview lists 260,000 BTU per hour on the reserve tank and describes the regulator as designed for high flow in cold temperatures. The listed dimensions are 8 by 4 by 3 inches.
- Two-stage pressure regulation
- 11-inch WC output pressure
- 3/8-inch NPT outlet
- 1/4-inch inverted-flare inlets
Choose this product if its capacity and fittings suit the RV’s propane system and appliance demand. Its listed details do not say that pigtails are included, so verify the package contents and plan for compatible connections if needed.
Cavagna Kosan 924N Dual-Cylinder Regulator
Best for: RV owners replacing or upgrading a dual-cylinder setup with a stated 160,000 BTU capacity. It is selected for its two-stage automatic changeover design and pre-mounted L bracket, which the product description identifies as an installation feature.
The regulator automatically draws from the reserve cylinder after the active cylinder runs out, allowing the empty bottle to be changed without shutting off the supply. Its listed output is 11 inches WC. An indicator on top is intended to make it easier to check regulator status.
- Two-stage automatic changeover
- 160,000 BTU capacity
- 11-inch WC pressure
- Pre-mounted L bracket
This model may be a better fit when the system’s demand is within its stated capacity and the mounting arrangement is suitable. Its capacity is lower than the Flame King and Fairview options listed here, so compare it with the combined appliance demand before purchase.
RecPro Two-Stage Regulator With Hose
Best for: Buyers who want a compact regulator package with hoses included. RecPro lists automatic switching to the full tank, a red indicator window, and QCC1 hoses with a flow limiter and check valve.
The product weighs 2.5 pounds and measures 2¾ inches wide by 6¼ inches high by 6¼ inches deep. Its listed maximum working pressure is 250 PSI. The threaded inlets are ¼-inch female NPT, and the outlet is ⅜-inch female NPT.
- Automatic changeover with red status indicator
- QCC1 hoses included
- Compact listed dimensions
- 250 PSI maximum working pressure
Choose this option if the QCC1 hoses and NPT connections suit the existing setup. The supplied product details do not state a BTU capacity or outlet pressure in inches WC, so check the manufacturer’s specifications against the RV system before buying.
Flame King KT18ACR-2 With 18-Inch Pigtails
Best for: Dual-tank RV owners who need longer included pigtails than the 12-inch version offers. This model is selected because it pairs automatic changeover with two 18-inch hoses and the same stated 345,200 BTU rating.
Like other automatic changeover regulators in this group, it switches from the primary tank to the reserve when the primary is empty. The product details say the empty cylinder can be removed for refill without interrupting the propane supply. Its inlets are 1/4-inch SAE inverted flare, and its outlet is 3/8-inch NPT female pipe thread.
- Two 18-inch pigtails included
- Two-stage regulator
- 345,200 BTU rating
- UL-listed regulator
Choose this model when the longer hose length helps reach the tank connections. Confirm the routing and fitting requirements before purchase; a longer hose is not automatically the right choice for every tank compartment or installation.
Buying Guide: How to Choose a Propane Changeover Valve
What does an automatic changeover valve do?
An automatic propane changeover valve, often sold as an automatic changeover regulator, manages supply from two connected cylinders. When the active or service cylinder is depleted, the device switches to the reserve cylinder. This helps keep appliances supplied while the empty cylinder is removed for refill, provided the rest of the propane system is operating correctly.
Many RV models combine the switching function with a two-stage regulator. The regulator reduces tank pressure to a lower, steadier pressure for appliances. A changeover valve is not a substitute for checking the system’s pressure, fittings, and appliance requirements.
How much BTU capacity do you need?
Compare the regulator’s stated capacity with the total propane demand of appliances that may run at the same time. Relevant equipment can include a furnace, water heater, refrigerator, cooktop, and outdoor appliance connected to the system. Use the appliance data plates or manuals to determine demand rather than estimating from RV size alone.
Among the products here, Flame King lists 345,200 BTU, Fairview lists 345,000 BTU with 260,000 BTU per hour on reserve, and Cavagna lists 160,000 BTU. RecPro’s supplied product details do not give a BTU rating. Do not assume these models are interchangeable solely because each is described as a two-tank regulator.
Which fittings and hose length should you check?
Match the regulator’s inlet and outlet fittings to the existing system. The Flame King and Fairview product details list 1/4-inch inverted-flare inlets and a 3/8-inch NPT outlet. RecPro lists 1/4-inch female NPT inlets and a 3/8-inch female NPT outlet. These descriptions are not identical, so verify the exact connection style rather than relying on nominal size alone.
Also check pigtail length and package contents. The Flame King KT12ACR-2 includes two 12-inch pigtails, while the KT18ACR-2 includes two 18-inch pigtails. RecPro lists QCC1 hoses. The Fairview details provided do not specify included hoses. Make sure the hose reaches without pulling, kinking, or interfering with access to the cylinders.
Does outlet pressure matter?
Yes. A regulator must provide pressure appropriate for the appliances and the RV’s LP system. Fairview and Cavagna list 11 inches WC. Do not infer an unlisted pressure specification from a product name or appearance. Confirm the required outlet pressure in the RV and appliance documentation before selecting a replacement.
Is an indicator useful?
An indicator can help identify which cylinder is supplying gas or show a changeover status, depending on the specific model. Cavagna lists a top indicator, and RecPro lists a red indicator window. Indicators are useful for routine checks but do not replace confirming cylinder contents or inspecting the system when an appliance stops working.
What should you verify before installation?
Confirm that the regulator is intended for the application, that its connections match, and that its capacity and output pressure suit the system. Compare the replacement’s mounting arrangement and dimensions with the available space. If the included fittings do not match, do not improvise a connection. Have propane work performed or checked by a qualified RV technician when you are unsure about safe installation or leak testing.
Frequently Asked Questions
Can I remove an empty tank while the other tank is in use?
An automatic dual-cylinder changeover regulator is designed to switch supply to the reserve cylinder when the active cylinder is empty. The listed Flame King models specifically state that an empty cylinder can be removed for refill without interrupting propane supply. Follow the regulator instructions and safe cylinder-handling procedures.
Does a changeover regulator increase propane capacity?
No. It changes which cylinder supplies gas; it does not increase the amount of propane stored. The regulator’s BTU capacity describes its rated gas-flow capacity, not the size or fuel capacity of the cylinders.
Are all RV propane changeover valves compatible?
No. Models can differ in fitting types, hose lengths, output pressure, capacity, and mounting dimensions. Check each of these against the existing RV system before choosing a replacement.
What is the difference between 12-inch and 18-inch pigtails?
The stated difference is hose length. A 12-inch pigtail may suit a closer connection, while an 18-inch pigtail provides more reach where the tank layout requires it. Measure the installation and check the manufacturer’s routing guidance before selecting a length.
Should I choose a regulator with included pigtails?
Included pigtails can reduce the need to source hoses separately, but only if their length and connection types match the installation. Verify both details, along with the regulator’s inlet and outlet fittings, before purchase.