Flame King ACR-2
Automatic changeover · 345,200 BTU/hr
A dual-cylinder, two-stage regulator with an automatic switchover indicator. Requires correct inverted-flare pigtails for its inputs.
Flame King RV Propane Regulators: Auto-Changeover vs Two-Stage
Flame King makes different two-stage propane regulators for RVs, but not all connect to the same cylinder plumbing or perform automatic changeover. ACR-2 and its pigtail kit are built for dual-cylinder systems; G2R150B and the POL version are standard two-stage regulators with different supply inlets. This comparison helps you identify the exact part number before selecting a replacement.
Start with the propane system, not the regulator shape
One or two cylinders?Automatic changeover uses two cylinder inputs and selects the reserve supply when the primary cylinder empties. A standard two-stage regulator does not provide that function by itself.
Match the inlet connectionThe ACR-2 has 1/4-inch SAE inverted-flare inlets. G2R150B has a 1/4-inch female NPT inlet, while G2R150B-POL has a POL cylinder connection. These fittings are not interchangeable.
Check outlet and capacityAll four models listed here have 3/8-inch female NPT outlets and manufacturer-stated 11-inch water-column outlet pressure, but their gas-flow ratings differ.
Connection warning: A 1/4-inch SAE inverted-flare fitting is not a 1/4-inch NPT fitting. Flame King specifies inverted-flare pigtails for ACR-2 and advises against NPT pigtails on its inverted-flare inlets. Propane regulator replacement and leak/pressure testing should be carried out by a qualified gas technician.
Flame King regulator MPN and connection chart
The connections and BTU/hr capacities below follow the manufacturer's exact-model information. Both G2R150B models are rated at 150,000 BTU/hr; the automatic-changeover models are rated at 345,200 BTU/hr.
| MPN | Style | Inlet | Outlet | Capacity | Included pigtails |
|---|---|---|---|---|---|
| ACR-2 | Automatic changeover | Two 1/4-in SAE inverted-flare inlets | 3/8-in female NPT | 345,200 BTU/hr | Not included |
| KT12ACR6 | Auto-changeover kit | Two 1/4-in SAE inverted-flare inlets | 3/8-in female NPT | 345,200 BTU/hr | Two 12-in pigtails |
| G2R150B | Standard two-stage | 1/4-in female NPT | 3/8-in female NPT | 150,000 BTU/hr | Not included |
| G2R150B-POL | Two-stage with POL | POL cylinder connection | 3/8-in female NPT | 150,000 BTU/hr | Not included |
Flame King's catalog uses KT12ACR6 for the 12-inch pigtail kit; its current website also identifies the corresponding kit as KT12ACR-2. Confirm the number printed on the actual supplied package.
Shop Flame King regulators by exact model
The product cards below connect to the individual NewRVParts listings. Check your original cylinder arrangement, the existing inlet fitting and the regulator mounting orientation before choosing a replacement.
Automatic changeover — dual cylinders
Flame King KT12ACR6
Auto-changeover kit · 345,200 BTU/hr
Auto-changeover regulator sold in a kit with two 12-inch cylinder pigtails. The manufacturer also identifies the kit as KT12ACR-2.
Standard two-stage — different inlet fittings
Flame King G2R150B
Standard two-stage · 150,000 BTU/hr
Two-stage regulation for a compatible single-supply arrangement. Unlike ACR-2, it does not automatically select between two cylinders.
Flame King G2R150B-POL
Two-stage with POL · 150,000 BTU/hr
Two-stage model with a POL inlet connection. A POL fitting is different from the female-NPT inlet on G2R150B.
Common regulator selection questions
Does G2R150B automatically switch between propane tanks?
No. G2R150B is a conventional two-stage regulator. Choose a regulator specifically designed for automatic changeover when the installation calls for that function.
What is the difference between G2R150B and G2R150B-POL?
Both are manufacturer-rated at 150,000 BTU/hr with 11-inch WC outlet pressure. Their supply inlets differ: G2R150B uses 1/4-inch female NPT, while G2R150B-POL has a POL connection intended for compatible propane-cylinder valves.
Does ACR-2 come with two pigtail hoses?
The regulator-only ACR-2 listing does not include pigtails. The KT12ACR6 kit includes the automatic-changeover regulator and two 12-inch pigtails. Confirm the package contents in the exact product listing.
Can I install a regulator with matching outlet threads without checking the inlet?
No. The inlet style, permitted mounting orientation, outlet pressure, regulator capacity, cylinder arrangement and applicable gas code all matter. Have a qualified gas technician verify the complete installation.
Related propane-system reference pages
For an overview of how the components connect, visit RV propane regulator and two-cylinder changeover diagram. For cylinder connections and hose ends, see inverted-flare versus NPT propane pigtails and POL, QCC and cylinder-fitting identification.
Use the equipment's exact manufacturer instructions and applicable propane regulations when servicing gas systems.
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