Flame King ACR-2a 2-Stage Auto Changeover LP Propane Gas Regulator for RVs, Vans, and Trailers (Without Pigtails)

Perfect fit for my camper. Works like it should. The auto change over is great.

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

Works great. Just what I needed.

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.

A great replacement for my recalled regulator.

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.

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!

This Automatic Changeover LP Propane Gas Regulator was perfect for adaption to my home made Custom Built Propane Station

Needed to replace regulator on our fifth wheel trailer and this made for a simple, painless fix. ( Note I used existing pigtails which were still perfect)

This is a solid and quality built product. The manufacturer supplies it with pigtails and without the pigtails. I bought the latter version planning to use my existing connectors. I now recommend buying it with the pigtails or buying pigtails as a separate item. The reason is there are 2 types of connector the 1/4" Male NPT, and/or the 1/4" inverted male flare. They look the same but they are not. Newer regulators like this one seem to have the 1/4" inverted male flare so my old pigtails must be ones that use the 1/4" Male NPT because they won't fit. You probably wont know what size your old ones are so why not just buy new pigtails of the correct size when you order the regulator and be connected in a fraction of the time? If I had done this the job would have been done in about 15 minutes. There may be an adapter to convert one type to the other but the more connections you have the more likely you could have leak. When working with propane it is better and safer to do it right the first time. So double check before you order. Size matters.

Like other reviewers who needed to change the fittings for different pigtails, I needed to remove one of the fittings to adapt another hose. Again, like the others, a good amount of heat applied right to the fitting, BEFORE even trying to remove it worked well. A couple of minutes with a propane torch and the fitting came out easily. The regulator works well and even produced a better flame on the RV stove than the 34 year old one it replaced. That one had a lot of wax build up in it from so many years of use. This was a good choice in my view.

I liked that it was practically identical to my original one but additionally it has a removal cover. I didn’t like that brute force was needed to remove my old one and I couldn’t have done it alone. Also my pigtails did fit it but only after removing the nut connector and then inserting it directly into the unit. However, I just found out here that the price has been reduced by approximately $7 and I am not happy about that since I just bought this recently within the last month!

Had this unit for one month. Removed the empty (two tank setup) tank in the morning to be refilled. Changeover dial was turned to full tank. When I came back in the afternoon to install the full tank, I could hear hissing from the disconnected hose and smell propane. Don't know how long it was leaking, but this is a dangerous situation. 2nd Flame King I have replaced due to faulty unit within 2 years.. Never again will I buy Flame King