This guide highlights top LPG auto changeover regulators for RVs, campers, and trailers. It helps buyers choose reliable two-tank systems that automatically switch from primary to reserve tanks, ensuring uninterrupted propane supply. Best for frequent travelers, full-time RVs, and cooks who rely on propane-powered appliances. The following products are selected for solid build, dual-tank compatibility, and clear maintenance notes. A quick comparison table follows to aid quick scanning.
Selected products at a glance (quick reference)
- Flame King KT12ACR-2 — 2-Stage Auto Changeover with 12″ pigtails
- Cavagna Kosan 924N — Dual-tank, 2-stage, corrosion resistant
- Flame King KT18ACR-2 — 2-Stage Auto Changeover with 18″ pigtails
- Fairview GR-9984 — Dual-tank, 11″ WC, high-flow design
- Flame King ACR-2a — Dual-tank, without pigtails
Flame King KT12ACR-2: Compact Two-Stage Changeover Regulator
The Flame King KT12ACR-2 is a two-stage auto changeover regulator designed for RVs with dual propane tanks. It automatically switches from the primary to the reserve cylinder, reducing the chance of gas interruptions during travel. It includes two 12-inch pigtails to connect to the tank or supply, and its UL-listed regulator supports 345,200 BTU. Inlets are 1/4″ SAE inverted flare and the outlet is 3/8″ NPT female pipe thread. Best for: RVs with two tanks needing compact, reliable operation where space is limited.
Best for travelers who want easy swapping without interrupting propane flow. A noted limitation is that shorter pigtails may be less adaptable in some setups; verify clearance when mounting near other lines. The regulator’s dual-tank design is suited for stable, continuous flame, but installation clarity is essential for proper sealing and connection.
Cavagna Kosan 924N RV Regulator: Durable Dual-Tank Changeover
The Cavagna Kosan 924N is a 2-stage auto changeover regulator designed for RVs and trailers with a dual-tank setup. It automatically draws from the reserve cylinder and uses a switching valve to swap bottles without shutdown. This regulator emphasizes simple top-indicator checks for status visibility and provides steady 11″ WC pressure for reliable appliance performance. Best for: RVers who want a rugged, easy-to-monitor regulator that maintains consistent flow across a trip. Limitation: installation may require a stable mounting bracket for the top indicator and regulators can vary by vehicle layout.
Flame King KT18ACR-2: Higher BTU Capacity with Longer Pigtails
The KT18ACR-2 mirrors the KT12ACR-2 in core features but adds extended 18-inch pigtails for easier connection in larger RV installations. It automatically switches from primary to reserve tank when needed and is UL-listed with 1/4″ inverted flare inlets and 3/8″ NPT outlet. Rated for 345,200 BTU. Best for: RVs with a longer hose run or where the regulator sits farther from the tanks. Caution: ensure the longer pigtails do not create tripping hazards or interfere with other equipment.
Fairview GR-9984: High-Flow, Cold-Weather Ready Regulator
The Fairview GR-9984 delivers uninterrupted propane with dual-tank auto-changeover and a high-flow design capable of handling up to 345,000 BTU, with a steady 11″ WC output. It uses 3/8″ NPT outlet and 1/4″ inverted flare inlets, and its compact 8″ x 4″ x 3″ form fits many RV configurations. Best for: RVers who demand strong daytime performance in cold weather and higher appliance loads. Note: cold-weather performance can vary with tank temperature and fuel level.
Flame King ACR-2a: Dual-Tank Regulator Without Pigtails
The ACR-2a provides a two-stage auto changeover solution designed for RVs and trailers with dual propane tanks, without included pigtails. It supports a 345,200 BTU rating and uses 1/4″ SAE inverted flare inlets with a 3/8″ NPT outlet. Best for: buyers who plan to source their own hoses and fittings or upgrade an existing setup. Limitation: the regulator ships without pigtails, so compatible hose selection and mounting clearance are essential.
2 Stage Auto Changeover With 36″ RV Pigtail Hoses
This 2-stage regulator package includes 36″ pigtail hoses with gauges, designed for RVs and trailers. It automatically switches from primary to reserve tank when necessary and uses a 1/4″ inverted flare inlet with a 3/8″ NPT outlet. Best for: RVers who want a complete regulator and hose kit that is easier to install in one go. Caution: installation notes emphasize correct sequence to avoid leaks during hose connection.
Buying Guide: Key Purchase Considerations
What are the main differences between 2-stage vs 3-stage or single-stage regulators?
Two-stage regulators provide more stable gas pressure than single-stage models, especially as tanks empty. They reduce fluctuations that can lead to inconsistent appliance performance. Three-stage variants are rare in RV setups; two-stage is typically sufficient for most travel and camping needs.
What should I know about dual-tank setups?
Dual-tank regulators automatically switch from a primary to a reserve tank when the primary is depleted. This ensures a continuous propane supply for stoves, heaters, and water heaters. Check compatibility with your tanks’ valve types and ensure hoses and pigtails match the regulator’s inlets/outlets.
How do I determine the right BTU rating?
BTU rating indicates the regulator’s capacity. For most RVs, 210,000 BTU/hr primary and 130,000 BTU/hr reserve are common specifications. Higher BTU capacity is beneficial for rapid heating or high-use appliances, but ensure your entire LP system can safely handle it.
What about installation considerations?
Look for regulators with clearly labeled inlets (1/4″ SAE inverted flare) and outlets (3/8″ NPT). Ensure you have proper mounting, clear access for inspection, and appropriate hose lengths. Follow all safety guidelines to avoid leaks during installation and operation.
Maintenance and safety tips
- Inspect connections for leaks using approved soapy-water methods; never use a flame to check leaks.
- Keep regulators away from heat sources and ensure adequate ventilation around propane components.
- Periodically replace hoses and pigtails showing wear or cracking.
FAQ
- Q: Do all dual-tank regulators require pigtails? A: Most include pigtails, but some models ship without them; verify package contents before purchase.
- Q: Can I retrofit my existing RV with a two-tank regulator? A: Yes, if the regulator is compatible with your tank fittings and space allows installation.
- Q: What does “11″ WC” mean? A: It is the regulator’s working pressure expressed in inches of water column, indicating a low, steady pressure suitable for RV appliances.
- Q: Are these regulators suitable for cold-weather use? A: Many are designed for cold weather; check manufacturer specs for BTU performance at low temperatures.
- Q: How do I know if a regulator is UL listed? A: Look for a UL listing label on the regulator or official product documentation.
- Q: What if I notice pressure fluctuations? A: Inspect connections for leaks and ensure the regulator is properly installed with correct hose routing.