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

This regulator is a game changer for northern gardeners!! Being in a cold area, one of my biggest fears when starting summer crops (starting in February) in the greenhouse is running out of propane and losing heating! Not anymore! I have the regulator hooked up to 2 100lb propane tanks. It worked flawlessly when they empty. Indicator turns red as advertised; the other tank takes over. There was no interruption of the propane flow to the heater. HIGHLY recommend to anyone that heats a greenhouse!

I used this on my Camping trailer. Old one crapped out and I bought this. The setup for the lines to the tanks was different than my old one and I had to buy some adapters. So far it has worked great. No leaks. Seems durable enough. Been a year and so far no issues. Would recommend

Perfect fit

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, yellowpolyethylene 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.

Direct replacement, no issues, would buy again.

My original regulator on my camp trailer finally gave up the ghost after 21 seasons so I found this one here on Amazon and it was super easy to install and works like a champ.It handles my cook stove, heater and water heater with ease.

Everything went as expected.

I thought this job would take me 5–10 minutes, but I ended up spending 2 hours in vain. They put adapters on that have connectors just slightly smaller than the pigtails I have on the same Flame King model. I tried every trick in the book to remove one, but I couldn’t. Why in the world didn’t they just put these adapters in a little bag and let people use them if needed? What an unnecessary waste of time. I had read some people had problems with the plastic pigtail connectors, that connect to the gas tank, breaking. I only had the the previous ACR-2 for a year. It quit reading correctly and didn't switch tanks when one was empty. I thought, at least, the plastic connector didn't split, like some people complained about, so I'd use them and save a few bucks as well. Now, I can't take that risk and will have to order a unit that comes with pigtails.