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Mighty Mule

Model # FM502-STP

Internet # 100431555

Heavy Duty Dual Swing Automatic Gate Opener Access Package

This item has been discontinued.
The Home Depot no longer carries this specific product.

Was   $799.00
$699.00 /each

Save $100.00 (13%) through 11/26/2015

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Promotion Details
Price Valid : 11/06/2015 - 11/26/2015
Save on select items from GTO
  • Designed for the "Do-It-Yourself" installer
  • Package includes 2 additional remotes and a digital keypad
  • Ideal for dual swing gates up to 18 ft. or 850 lbs.




Model # FM502-STP

Internet # 100431555

The Heavy-Duty Dual Swing Automatic Gate Opener Access Package (FM502) is Mighty Mule’s strongest dual gate operator. Offering two additional single button remotes and a wired or wireless digital keypad, the gate opener is designed for dual swing gates up to 18 ft. or weighing up to 850 lbs. per panel. This package is ideal for ornamental, vinyl, tubular steel farm gates, chain link or wood gates.

  • Includes 3 single button access remotes (FM135), wired or wireless digital keypad (FM137), AC transformer (RB570), battery (FM150), control box, all required hardware and a detailed installation manual with interactive DVD
  • Ideal for dual swing gates up to 18 ft. or a maximum of 850 lbs. per panel
  • Perfect for all gate types including ornamental, vinyl, tubular steel farm gates, chain link or wood gates
  • 30% Residential energy efficient property tax credit available, residential home owners can use this credit on a new operator system, accessories and installation with the purchase of a Mighty Mule solar panel; 10-Watt (FM123)
  • Mighty Mule offers strong, elegant steel gates on that can be shipped directly to your home
  • Backed by a 18-month Mighty Mule warranty and technical support

  • Home Depot protection plan available

    Home Depot Protection Plan

Info & Guides

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Maximum gate size (ft.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Commercial/Residential Use 
Fencing Product Type 
Gate Opener Kit 
Gate opening style 
Hardware Included 
Lighting Included 
Power Requirements 
AC or Solar 
Product Weight (lb.) 
56 lb 
Remote control included 
Weight Capacity (lb.) 
Wired or Wireless 
Warranty / Certifications
Manufacturer Warranty 
18 month on openers, 12 month on accessories 


Rated 4.0 out of 5 by 20 reviewers.
Rated 4.0 out of 5.0 by A quality product with quirks I think if you have a perfect gate, I trust the product would work consistently. However, my gate is a wooden gate that is not perfect, so I am having consistency issues (as shown in my video). Some of these issues were the result of the gates touching slightly in the closed position since the wood grows and shrinks). I resolved this by setting the slave close stop with a slight gap (shown in picture). This took 5 tries to get the master gate to learn the correct position for some reason. But I have to note that the master gate will close 45% of the time with a gap larger than what is shown, 45% keep pushing against the slave gate (which always seems to close properly) until it actually pushes the gate outward, and 10% close as requested. I still don't quite understand why this is the case, but would love feedback if anyone has ideas. In my case, if the master gate pushes the other gate outwards, the gate opener will think it hit an obstruction when I open the gate, and often go into a fail mode. This means I have to go into the house from the front and reset the opener. For this reason, I still have to watch the gate close, and don't feel confident to just drive away until I've confirmed it is OK. My gate is probably at the minimum weight/length for the 502 series, because I assumed it would help the gate close faster, and last longer since it is doing less work. However, as shown in the video, it doesn't open very quickly at all. The product comes with everything you need except low voltage wire (conduit), and strain relief nut for it. I was disappointed to find that the product did not come the necessary and matching 3rd strain relief nut. Installation was not difficult, but it does take time. About 3-5 hours in my case including digging trenches for the slave gate wire, and cutting holes in the house for power. I have only had the product for 4 months, so I can't comment on the longevity. However, seems to still be working as new. The remotes seem to work from the street at end of my driveway the majority of the time. Sometimes it's hard for me to tell whether the gate is actually opening, I wonder if there is a strobe or siren I could buy? I gave the product 4 stars because it is a quality product and it does work, however the inconsistency and the slow speed I believe should not be something I should have to deal with at this price point. Problem is, I don't know if my gate or my install are causing the issues that I am seeing, so 4 stars seems fair. In the future, I would like to see solutions for triggering/getting notifications from the system with home automation. August 9, 2015
Rated 4.0 out of 5.0 by Tough, strong and handy No more getting out of the car to open or close the gate. Smooth, quiet action closes gates at the click of a button. My brother in law has had his got 10 years without a let down. That kind of life service makes it a reasonable cost per year. July 7, 2015
Rated 1.0 out of 5.0 by Absolutely the most aggravating thing I've ever owned! Following a pretty simple installation of the 350/352 the system ran pretty smoothly for about 3 months. After that connections start to fail, boards go down, water somehow gets in, or it just quits. After the initial install (over the last 3 years) I would estimate I've worked over 40 hours at the end of my driveway on the phone with their tech support. There is never the same issue twice, and you never get the same instruction twice. This thing is so aggravating I've just kept my drill, screwdrivers, voltage meter and manual in my truck for the last two years in anticipation of it quitting. Every nice day that I can handle going back out there I try again. $1300 for a cheap parts and poor design. Don't waste your money. March 14, 2015
Rated 2.0 out of 5.0 by Not very good quality I purchased a single gate opener. The install and set up were fairly easy. Good instructions. The opener lasted less than one year then began to give trouble. The electronics appear cheap. It worked intermittently and then quit altogether. Purchased a second system and it only lasted 6-9 months. The price is OK but it doesn't last. Finally had to go with a different brand which cost more but has n o issues. Spend more once and get a better system. March 23, 2015
Rated 4.0 out of 5.0 by Works as advertised Installation was easy - instructions were right on. It has been working without any problems for about two months. It is slower than I would like and sometimes when using the remote transmitter when approaching the gates it starts to open and then stops at about 6 inches requiring closing and starting over. I have not determined if my vehicle is interfering with the signal or not. If I come to a complete stop it works ok. Overall I am happy to have it. January 22, 2015
Rated 5.0 out of 5.0 by comfortable security Very satisfied with the overall results but as a DYI project it was hardly as easy for me as the video would have you believe. I'm a pretty handy person but found almost every step shown was not like my situation and required hours more work to complete ie, a concrete driveway which required cutting to bury the slave power cable, a sloping steep driveway with high walls on both sides requiring all work to be done from one side, well, you get the picture. But even with all that, this product does the job very well and I would still do it again. Your situation has to be easier than mine was. October 14, 2014
Rated 1.0 out of 5.0 by Use caution when reading reviews. Excellent ratings first 3 months, Terrible rating after a few months. We have been researching Dual gate openers and found that Quality is all over the board. read the manufacturers LIMITED WARRANTY. WHY is it limited ? Plastic and cheap gears and mechanical parts. Cheap phenolic PC boards or Fiberglass Epoxy high quality boards designed for outdoor use in inclement weather? Please read the comments of the other one star rating. You may need a bucket of tools and back up replacement parts every time you try to enter/exit this gate.. Think about how nasty it to repair a new gate during a rain storm. Make sure you have plenty of extra pc BOARDS AND OTHER PARTS.. Other than this---the gate works great! I recommend this gate for house flippers and anyone who is selling their house. Gates work great for long enough to sell the house. Note the LIMITED warranty is LIMITED.. March 23, 2015
Rated 5.0 out of 5.0 by Staying Warm and Dry It is so nice and convenient to have an electric gate opener. We replaced a single gate with a double gate and were very happy that we could reprogram our existing remotes to operate the new system. We also have 2 existing solar panels so we had to buy a new battery (the system came with 1 battery) but that was no big deal as the batteries are very reasonably priced. We also chose to buy a second key pad so that our visitors could get out as easily as they got in! We are extremely happy with the new 2 gate heavy duty Mighty Mule automatic opener. January 27, 2015
  • 2015-11-23 T10:55:17.210-06:00
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