SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3+8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home
SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3+8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home
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SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3+8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home

4.3 stars out of 65 reviews
(4.3)|
65 ratings
SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3+8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home50 Amp Generator Cord Inlet Box 20FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici50 Amp Generator Cord Inlet Box 30FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici50 Amp Generator Cord Inlet Box 15FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici50 Amp Generator Cord Inlet Box 25FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici50 Amp Generator Cord Inlet Box 10FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici50 Amp Generator Cord Inlet Box 40FT RV Extension Cord NEMA14 50P SS2 50R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electrici
Cord Length:20 ft

Key item features

  • ➤【50-Amp RV Extension Cord】Engineered for high-power applications. Features a 4/3+8/1 AWG configuration (3 x 6 AWG conductors + 1 x 8 AWG ground wire) with 100% pure copper for maximum conductivity. Equipped with a standard adapter-style NEMA 14-50P male to SS2-50R female plug, compatible with most 50A RVs and generators. Its dual-voltage 125/250V design supports up to 12,500W of power output. The heavy-duty, flame-retardant PVC jacket offers superior abrasion and weather resistance, built to withstand tough outdoor conditions. Optimized wire gauge minimizes voltage drop over long distances.
  • ➤【50 Amp Generator Inlet Box】Comes with an SS2-50P three-prong plug that works with all NEMA SS2-50 standard 50-amp generator cords. The upgraded design includes four pre-drilled mounting holes for easy, tool-free installation. Dual-side cable entry and a spacious interior allow smooth routing of thick cables through pre-set ports. The roomy layout ensures cleaner wiring, better heat dissipation, and extended product life.
  • ➤【ETL-Certified Safety】This 20ft 50-amp RV power cord and inlet box kit is ETL-certified, delivering reliable and safe outdoor power. The inlet box includes a safety indicator light—green means go. For optimal performance, fully extend the cable during use to prevent overheating and verify that the 4-prong plug (NEMA 14-50P) matches your outlet. Designed specifically for RVs, this extension solution offers a safer, more convenient power experience.
  • ➤【All-Weather Durability】Built with high-purity stranded copper cores and rated IP68 for complete waterproof protection. A dual-layer STW sleeve and heavy-duty flame-retardant heat-resistant PVC exterior guard against sun, rain, and physical wear while remaining flexible for easy storage. The female connector features an adjustable threaded locking ring for a secure, waterproof seal. The heavy-gauge metal inlet box is coated with anti-rust finish and uses a twist-lock connector to ensure a solid, weatherproof connection that stands up to rain, wind, and corrosion. The flip-cover design, paired with an internal high-density waterproof gasket, effectively keeps out dust and moisture for long-lasting reliability.
  • ➤【Ergonomic Handle Design】The ergonomically shaped handle offers a comfortable, secure grip that fits naturally in your hand. It makes plugging and unplugging easier while reducing strain on the plug and cord—enhancing durability and safety.
  • ➤【Flexible & Easy to Store】Made from tough yet flexible materials that stay pliable even in temperatures as low as -40°F, resisting kinks and cracks in harsh outdoor environments. Includes an adjustable cable winder for neat coiling and hanging—making transport and storage tidy, tangle-free, and convenient.
  • ➤【Wide Range of Uses】This outdoor extension cord provides a reliable backup power supply during emergency outages and delivers stable, high-output electricity for camping, RV hookups, yacht power, job sites, and outdoor events. Whether responding to unexpected situations or meeting daily outdoor power needs, it ensures safe, dependable power anytime, anywhere—so you never have to worry about staying connected.
Current price is Now $119.99
You save $110.00
was $229.99
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Columbus, 43215
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4.582222222222223 stars out of 5, based on 225 seller reviews(4.6)
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About this item

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SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3 8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home $119.99 Was $229.99

SPEEDWOW 20 FT 50 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, 6/3 8/1 Gauge STW ETL Listed, NEMA 14-50P to SS2-50R, Waterproof Power Cord for RV Outdoor Home
current price Now $119.99, Was $229.99

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Customer ratings & reviews

4.3 out of 5 stars
stars65 ratings22 reviews
How item rating is calculated
  1. 5 stars69% (45)
  2. 4 stars14% (9)
  3. 3 stars5% (3)
  4. 2 stars5% (3)
  5. 1 star8% (5)

Reviews summary

Pros
  • : Offers affordable options compared to similar products.
  • : Made with sturdy and long-lasting components.
Cons
  • : Difficult to securely connect wires to the socket.
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Showing 1-3 of 22 reviews

Mar 4, 2025
Bowshootga
Item details
Size: 15'
Color: Black+Yellow 50Amp
Sold and shipped bySPEEDWOW
5 out of 5 stars review

Verified Purchase

Great easy to use package for generator power

Great package item. Everything arrived as ordered and in great shape. What you need to hook your generator to an outlet. You will also need to run a line from the box to your breaker panel and install a 50 Amp breaker switch. Be sure to turn your main power switch off before using. Main power switch to electical power must be off before installing and use.

Incentivized Review
Helpful?5LNZYHM659NQ7162410134
Dec 24, 2025
thomas
Item details
Cord length: 10 ft
Sold bySPEEDWOWDelivered byWalmart
5 out of 5 stars review

Verified Purchase

this is heavy duty and works great

Helpful?5LNZYHM659NQ7162410134
Sep 28, 2025
Michael
Item details
Cord length: 15 ft
Color: Yellow 50A+PC Box
Sold bySPEEDWOWDelivered byWalmart
5 out of 5 stars review

Verified Purchase

Skin protection

Great for older people like me with skin conditions during the winter to protect from the sun

Helpful?5LNZYHM659NQ7162410134