Flame King ACR-2a 2-Stage Auto Changeover LP Propane Gas Regulator for RVs, Vans, and Trailers (Without Pigtails)
Condition: New
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Availability:
In Stock.
Arrives
Friday, Jul 17
Style: Newest Model
Features
- Allows removal of an empty cylinder for refill without interrupting the propane supply
- For RVs with dual propane tanks, it automatically switches from the primary tank to the reserve tank when the primary is empty
- UL LISTED: Inlets are 1/4" SAE inverted flare, and the outlet is 3/8" NPT female pipe thread; rated for 345,200 BTU
- Double-stage design maintains constant gas pressure under changing demand and conditions; the regulator is factory set at 11" WC (water column); lockout pressure is up to 14.9" WC
- Compatible with Flame King's 48-inch Thermo Plastic Hose (Model 100383-48) and 12-18 inch INVERTED FLARE Pigtails (Models E12INPT, E15INPT, or E18INPT)
- For your safety and to ensure leak-free performance, these regulators are assembled using high-strength thread-locker (Loctite) on the adapter connections where the pigtails are attached. This is an intentional safety measure designed to keep critical fittings secure and prevent gas leaks during use.
- Note: NPT pigtails are not recommended.
Features
- Allows removal of empty cylinder for refill without interrupting propane supply.Fit Type: Universal Fit
- For RVs with dual propane tanks; Automatically switches from primary to reserve tank when primary is empty
- Pairs well with our 48 Inch Thermo Plastic Hose, item 100383-48.
- Double stage design maintains constant gas pressure under changing demand and conditions
- Inlets are 1/4" SAE inverted flare and outlet is 3/8" NPT female pipe thread
Manufacturer: Flame King
Brand: Flame King
Model: ACR6a
Item Weight: 1.74 pounds
Product Dimensions: 7 x 4 x 4 inches
Country of Origin: China
Item model number: ACR6a
Exterior: Machined
Manufacturer Part Number: ACR6a
Date First Available: March 4, 2021
Manufacturer: Flame King
Brand: Flame King
Model: ACR-2a
Item Weight: 1.74 pounds
Product Dimensions: 7 x 4 x 4 inches
Item model number: ACR-2a
Exterior: Machined
Manufacturer Part Number: ACR-2a
Date First Available: March 4, 2021
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Jul 17
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Perfect fit for my camper. Works like it should. The auto change over is great.
Reviewed in the United States on February 20, 2026 by Steve and Marion
Purchase this to replace a regulator that was recalled by the RV manufacture, Keystone. This was much cheaper than trying to take it back to the dealership and leaving it there for a week for them to jerk around. Very simple to install
Reviewed in the United States on December 21, 2025 by B king
Works great. Just what I needed.
Reviewed in the United States on March 6, 2026 by GR, Hawaii
Gas for the on-demand water heater at my rural vacation rental is supplied in 100-lb cylinders or "tanks". As auto-switch regulators are not available locally, it seemed a good idea--and it was--to order via Amazon. However, as product information is sketchy, requests for guidance from "Mendel" at Flame King were a wasted effort, and since there is a good deal of misinformation re installation in the buyer comments, I offer what I wish I had found all in one place. It took days to learn what Flame King should have told me. Installation is easy, takes only a few minutes, IF you have at hand all the fittings you need. 1. MOUNTING bracket attached to the regulator is a horizintal flat metal plate with a pre-drilled bolt hole, easily affixed to any horizontal wooden or metal bar or shelf with a a bolt, a nut and a couple of washers. Time involved: depends on whether you need to a drill a hole on the mounting surface; otherwise 30 seconds. 2. INLETS: Regulator is shipped with PERMANENT brass female reverse-flair (concave) inlet fittings to accommodate threaded ¼" brass reverse-flare (convex) "pigtail" fittings. Some purchasers complain about difficulty in removing these permanent fittings, which is hard to do, will break the factory seals, and is a waste of effort. If your existing pigtails or new ones your order (see below) are of the male ¼" NPT (flat-end) type, you will need TWO ADAPTERS, ¼" female NPT to male ¼" reverse-flare (convex), available locally or via Amazon. Using yellow wrapping tape for gas, install the adapters (if needed) to the inlet fittings, wrap the pigtail connectors and install. Total time, maybe 3 minutes. 3. In some countries (not the US, but the one where I live), propane cylinders ("tanks") have reverse-thread connections (left or ccw to tighten, right or cw to loosen) called POL connections for the original manufacturer. If you use existing or new POL pigtails, see the note above about NPT vs. reverse-flair fittings. Time involved: for connecting pigtail to tanks, 15-30 seconds each side. 4. OUTLET. Regulator outlet has a ⅜" female pipe-thread fitting, and details of connection to the gas line supplying one or more appliances, depends on the nature of the existing installation. Whether cast iron, yellow polyethylene plastic pipe or (obsolete) copper piping, you will need a ⅜" male brass or polyethylene fitting to connect to the regulator. (Galvanized steel pipe not rec. for propane). 5. Finally, Amazon offered a "buy together" package including the POL reverse-thread pigtails I needed, 2 NPT-to-reverse flair adapters for the regulator inlets, and a roll of wrapping tape, all of which simplified ordering, worked perfectly and saved a whole lot of time.
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Reviewed in the United States on April 7, 2023 Reviewed in the United States on April 7, 2023 by David M. Fishlow
I purchased this product and received it on 1/3/2026, the valve stopped working and I contacted flame king. They aggreed that the valve was defective and gave me a amazon nuber to call to have it replaced. Amazon uses AI to answer their complaints and after asking me about four stupid questions and sending a text and e-mail to see if I had a account, it told me it couldn't be returned and hung up. I will keep buying flame king products but not from amazon.
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Reviewed in the United States on February 13, 2026 by Amazon Customer
A great replacement for my recalled regulator.
Reviewed in the United States on February 26, 2026 by Mary Beth Embree
Good quality regulator been using it for a year now with no issues
Reviewed in the United States on April 29, 2026 by David Johnston
i got this to replace the crappy camco changeover regulator my trailer came with. it was literally ZIP TIED to the post because they apparently don't come with something as basic as a MOUNTING BRACKET. not only that, but if you changed it over and took off your dead tank, you could smell a teeny bit of gas coming out the other end. idk how old it was, but yikes! this guy has neither of those problems, even tho i put the bracket on the wrong side of the bar at first LOL. it's a solid unit, one of the bigger trailer regulators i've seen. as shown, im using it with two 90° tank hoses from gasgear for use with tank pressure gauges. excellent combo! don't forget the PTFE tape, and check for leaks!!! i legit changed this out while camping on the desert easter weekend LOL. it's super easy to change out!
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Reviewed in the United States on March 31, 2024 Reviewed in the United States on March 31, 2024 by Aspen