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  1. RV Power Inlets
  2. SmartPlug
  3. 50 Amp Male Plug
  4. Stainless Steel
  5. Power Inlets
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SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel

SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel

Item # SM79FR
Retail:$270.30
Our Price: $200.60
You Save: $69.70
RV Power Inlets
Shipping Weight: 1.55 lbs
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Get your ride SmartPlug ready. Replaces the fiddly twist lock inlet with a more secure and safe connection. Plug in with ease and have one less thing to worry about. Installs into the same footprint as a standard inlet with no modification needed. Great Prices for the best rv power inlets from SmartPlug. SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel part number SM79FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (120)
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SmartPlug RV Power Inlets - SM79FR

  • 50 Amp Male Plug
  • Stainless Steel
  • Power Inlets
  • SmartPlug
  • Square

Get your ride SmartPlug ready. Replaces the fiddly twist lock inlet with a more secure and safe connection. Plug in with ease and have one less thing to worry about. Installs into the same footprint as a standard inlet with no modification needed.


Features:

  • Inlet lets you plug in your SmartPlug cord to power your RV or boat
    • 4-Prong male inlet accepts SmartPlug 50-amp female connectors (sold separately)
    • Cables lock in place for secure connection
  • Straight-in, single-step operation means no more twisting or fiddling with locking rings
    • Plug shape takes guesswork out of connecting so it's simple to use, even in the dark
  • Flat electrical pins increase contact area compared to curved pins in twist locks
    • Reduces heat caused by electrical resistance
  • Inlet cap snaps down onto plug body when in use to reduce strain
    • Helps stop plug from being yanked out accidentally
  • Rubber seal keeps inlet safe from the elements when not in use
  • High-quality materials hold up in extreme climates or out on the water
    • Marine-grade stainless steel external metals hold up season after season
    • Nickel-plated brass electrical pins and tinned wires resist corrosion
    • Plastics are UV and heat resistant Valox 553U resins
  • Easy installation - sized to fit standard inlets so you can use the same screws and holes
  • Made in the USA


Specs:

  • Amperage: 50 amps
  • Voltage: 125/250 volts
  • 7-Year warranty


SmartPlug vs. Twist Lock


RV and boat owners have long relied on Twist Lock style connections for powering their rides. For years, it has been the best option for connecting to shore power. It's been reliable, but most know it's not without disadvantages:


Twist-Type Design Problems

  • Curved pins make minimal surface contact, increasing the amount of heat generated
  • Locking ring can be prone to breaking, cross threading, and stripping out
  • Faulty locking ring puts strain on the connection
  • Wear and debris can loosen the fit, further decreasing surface contact
  • Circular plug shape isn't user friendly and takes some awareness of the orientation of the pins to insert correctly

SmartPlug's connector addresses each of these concerns and does all of the heavy lifting.


Locking arms grab the inlet, a clamp inside the plug body holds the cord, the inlet cap snaps to the top while in use, and the integrated seals weatherproof the connection. This helps prevent the wiggly, dirty connections that increase electrical resistance, which creates potentially dangerous heat.


Since it uses a square plug face, SmartPlug is able to use flat pins which create far more surface contact, further reducing the risk of high heat and electrical arcing. The square shape and flat pins also make it easy to plug in - no more twisting or guessing if the pins are lined up correctly.




BM50S SmartPlug 50 Amp - Stainless Steel Inlet w/ SS Cover Assembly






Customer Reviews

SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel - SM79FR

Average Customer Rating:  4.9 out of 5 stars   (120 Customer Reviews)

Get your ride SmartPlug ready. Replaces the fiddly twist lock inlet with a more secure and safe connection. Plug in with ease and have one less thing to worry about. Installs into the same footprint as a standard inlet with no modification needed.

by:

Very good product. Works well and cord is nice and flexible allowing for easy stowage. I like the clip on female plug instead of the screw ring. A lot easier to connect and disconnect.



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etrailer kept me in the loop on the backorder of the black SmartPlug, I understood the supply chain, but it was nice to be updated on the timeline for shipment. So nice for a company to keep you in the loop without having to chase the details!



by:

I really like the SmartPlug! I kept noticing the old plug would turn sometimes in the socket and just about unplug itself. The SmartPlug is always secure and easy to unplug when you are ready.



by:

Excellent customer service on the part of eTrailer. Had to exchange the stainless steel model for this one because of fitting issues. Product itself is well constructed and exceeds intended purpose!



by:

Easy to Install. Clear instructions but you can also find install videos on YouTube. Stainless cost slightly more than the plastic version but looks great on my Airstream.



by:

I found the installation of the inlet easy and the modification of the connector very easy. The instructions were very easy to follow and very comprehensive.

The only issue was the rear cover (pictured) for the inlet could not fit at the front location of may 2019 Airstream Flying Cloud 27 ft. FB. I also installed the cable port.



by:

The SmartPlug installed great and after a year of heavy use continues to perform perfectly! Electrical hookups are now quick and positive with solid connections!



by:

Can’t wait to get it installed. Looks like quality materials and ease of installation per videos.



by:

E trailer is my go to shop for many of my components and appliances in my Van Builds. Their prompt delivery and customer service is excellent. Their consistency is something I can depend on Van to Van to Van.



by:

Delivery was a few days later than it said at first. Otherwise, product was what I ordered. No hardware sent with the inlet which was frustrating, why on earth wouldn't the company include the mounting screws?! Works fine otherwise.



by:

It's installed but still building trailer so have not gotten to use it yet. Will Update when i do!



by:

Excellent product. Install was not difficult. .definitely an upgrade from the original 50 amp plug.



by:

I received at least two emails updating me on the shipping dates and another one when it shipped. The Smartplug was on back order and they kept me up to date.



by:

I had been looking at this plug for awhile before I bought it. I was living full time in my camper. And my old twist style plug kept blowing the breaker on the power box. Bought this to replace it. No problems at all cents then. Love it. Easy to in stall.



by:

very high quality and easy installation.



by:

Excellent part, excellent customer service and support. etrailer is my go to for parts.



by:

This is a very well-built and designed product. I love the fact that it snaps securely to the inlet, and that the inlet closes securely when not in use. I got this to replace the mouse door that typically comes on campers (a huge hole port with a door that leaves a large gap while the cord is in use!). Keeping mice out is worth the price already, and this is a much better quality connector than I usually see on campers these days that use the detachable twist-lock type cords. Still working great after a year of use.



by:

This is a very welcome improvement for our RV's Electrical hookup. Easy to install, took about an hour.
One concern, the connector instructions that I downloaded stated to cut back the cable outer jacket 1.25". The instructions that came with the connector stated to cut back the cable outer jacket to 1.75". I feel the 1.25" was correct. 1.75" does not really give you enough exposed outer jacket to achieve the required 1/4" grip by the cable clamp swing arm.



by:

Easy to change cord plug. Outlet was a bit challenging as I couldn’t get wires pulled out far enough, so had service center do that part. It’s a little hard to push all the way in so side latches catch; but top latch secures.



by:

The quality of products that etrailer provides, as well as the pricing are just two of the reasons I shop here first. I have found it’s the rare circumstance that etrailer may not carry an item I’m looking for. In most instances it’s because the manufacturer is behind on shipments or their inventory. They have provided a great service and I’m a very happy customer.



by:

The Smart Plug is a quality upgrade to our Airstream. It looks good and was an easy quick install.


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See what our Experts say about this SmartPlug RV Power Inlets

  • Is the SmartPlug RV and Marine Power Inlet UL Listed
    The SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel # SM79FR is ETL listed which, to my understanding, is just a slight variation of UL listed. So while it doesn't have that exact rating, it's still safe to use and has been approved by OSHA standards for electrical use.
    view full answer...
  • Can SmartPlug RV and Marine Power Inlet SM79FR Accept 6 Gauge Wire
    Yes, the SmartPlug RV and Marine Power Inlet # SM79FR can accept 6 gauge wire.
    view full answer...
  • Does etrailer Offer Any RV Power Cords Made In The United States
    Yes, the SmartPlug line of power cords and all of their other accessories are all made here in the United States. Since you were looking at a 50 amp power cord you would need the SmartPlug RV Power Cord - 50 Amp - 30' # SM86FR along with the correct power inlet. Since you have a 2018 Airstream Flying Cloud Travel Trailer you'll most likely want the stainless steel inlet # SM79FR, but we also have a few other color options if you'd like: Black # SM56FR White # SM89FR Gray # SM29FR
    view full answer...
  • Parts Needed To Convert An RV From 30 Amps to 50 Amps
    You can upgrade your setup from a 30 amp to a 50 amp but it's going to be pricey and you're likely going to need to hire an electrician. The first thing you're going to need is to swap out your 30 amp inlet with the SmartPlug RV and Marine Power Inlet # SM79FR. This is going to require you to replace the existing wiring as well to accommodate for the extra amps. You'll also need a new control center, Progressive Dynamics 4500 Series RV Converter w/ Charge Wizard and AC/DC Distribution...
    view full answer...
  • Will Swapping A Trailer From 30 Amp To 50 Amp Service Affect The Value Of The Trailer
    Typically two AC units running at the same time is going to have such a large power draw that you'll need to have 50 amp service so the trailer should not have had two units with only 30 amp service equipment. To complete the swap over you'll need a 50 amp power cord, 50 amp receptacle, and a power center rated for 50 amp service. The answer page you were looking at from Dave that listed out the SmartPlug # SM79FR and # SM86FR along with the Progressive Dynamics # PD4590K18LS8 are all...
    view full answer...
  • Power Inlet Needed To Add Shore Power To An Enclosed Trailer
    If you're only wanting to setup AC service in your enclosed trailer then you could choose pretty much any 30 or 50 amp power inlet you wanted and then just run the appropriate gauge wire between the inlet and your panel. You can definitely install a 50 amp inlet and then just use a 50 amp to 30 amp adapter whenever you're at a site with only 30 amp service. You could use the Mighty Cord Replacement RV Power Inlet - White # A10-50INVP or # A10-50INBKVP for black. You'd need a minimum of...
    view full answer...
  • Converting RV From 30 Amp To 50 Amp
    Short answer, yes you can convert from 30amp to 50 amp. It will be costly and require an electrician. Long answer, you will need to replace the power outlet with SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel # SM79FR. Then replace the existing wiring to accommodate for the extra amps. You will need a new power cord like SmartPlug RV Power Cord - 125/250V - 50 Amp - 30' # SM86FR. You will need a control center like Progressive Dynamics RV Power Control Center with AC/DC...
    view full answer...
  • Installation of Progressive Dynamics # PD4560K18LS8 and Inverter Connection
    The Progressive Dynamics RV Power Control Center with AC/DC Panel and Converter/Smart Charger - 60 Amp, # PD4560K18LS8 that you linked to, will provide a full 60 Amps of DC charge to your battery bank. This is to be used with a 50 amp AC inlet such as the SmartPlug RV and Marine Power Inlet, # SM79FR. It is a 2-in-1 AC/DC distribution panel and converter charger that will power systems inside the RV and is compatible with either lithium or lead acid chemistry battery banks. The panel supplies...
    view full answer...

Do you have a question about this RV Power Inlet?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Amanda M
Edited by:
Amanda M
Employee David F
Test Fit:
David F
Employee Halie H
Written by:
Halie H
Employee Michael B
Installed by:
Michael B
Employee Cody B
Updated by:
Cody B

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