Flame King Two-Stage Auto Changeover Propane Regulator KT12ACR-2 — Dual-Tank, 2×12" Pigtails, 11" WC Output

Flame King KT12ACR-2 is a two-stage, automatic changeover propane regulator that keeps gas flowing from a second tank when the first runs dry. The Flame King KT12ACR-2 is built for RVs, vans, trailers and any dual-tank LP system where uninterrupted propane is important. This regulator automatically switches from the depleted primary cylinder to the reserve cylinder, uses a color indicator to show which tank is empty, and includes two 12-inch pigtails so you can hook the regulator to both tanks right away. Factory-set pressure and a two-stage design help provide stable output under changing loads.

How does the auto-changeover function work in everyday use?

The regulator senses when the primary tank has reached its end of service and mechanically shifts supply to the reserve tank without interrupting appliances. The color-change indicator provides a quick visual signal so you can service the empty cylinder at your convenience. Switching is designed to be automatic and reliable for travel and stationary setups.

• Automatic transfer from primary to reserve tank when primary is empty
• Color indicator shows which tank needs refilling
• Switching occurs without shutoff to appliances

What fittings and pressure ratings should I expect for installation?

The inlet connection uses a 1/4" SAE inverted flare while the outlet is a 3/8" NPT female thread, compatible with common RV plumbing and adapter options. The regulator is UL listed and factory set at 11" WC, and it’s rated to handle up to 345,200 BTU. Two included 12-inch pigtails simplify hookup to standard cylinder valves.

• Inlet: 1/4" SAE inverted flare; Outlet: 3/8" NPT female
• Factory set to 11" water column for consistent output
• Maximum rating: 345,200 BTU; UL listed

Why choose a two-stage regulator versus a single-stage unit?

The KT12ACR-2 uses a two-stage design to smooth pressure delivery as demand changes, which helps appliances run more steadily and reduces stress on lines and burners. Two-stage regulation improves performance when multiple appliances run at once or when demand fluctuates during cooking or heating. It’s a more stable option for mobile living and frequent temperature or altitude changes.

• Two-stage design provides steadier pressure under varying loads
• Reduces risk of pressure-related appliance issues
• Better for multi-appliance or changing-demand scenarios

What comes in the box, and how does it fit into an RV propane system?

The regulator ships with two 12-inch pigtails that attach directly to your cylinder valves, allowing immediate installation on an RV dual-tank manifold. It pairs well with longer hoses like a 48-inch thermoplastic hose when you need extra reach. The unit is designed to replace or upgrade standard twin-tank setups and to allow removal of an empty cylinder without interrupting supply.

• Includes regulator plus two 12" pigtails for tank connections
• Compatible with 48" thermoplastic hose for extended reach
• Allows empty tank removal while keeping gas flowing from reserve

Who is this for: The Flame King KT12ACR-2 is aimed at RV owners, vanlifers and trailer users who rely on continuous propane for cooking, refrigeration, heating or hot water. It’s a practical upgrade if you want automatic switching between two cylinders, an easy visual empty-tank indicator, and steady pressure control from a UL-listed, two-stage regulator. Choose this model when you need dependable changeover performance and straightforward installation with included pigtails.

FAQ

Q: Does this regulator switch tanks automatically?

A: Yes — it automatically transfers gas from the empty primary tank to the reserve without interrupting supply.

Q: Are pigtails included and what fittings are used?

A: Two 12" pigtails are included; inlet is 1/4" SAE inverted flare and outlet is 3/8" NPT female.