SPEEDWOW 20 ft 50 Amp RV Extension Cord with Generator Inlet Box, Yellow NEMA 14-50P to SS2-50R
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

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

113 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 HomeSPEEDWOW 20 FT 50 Amp RV Extension Cord 125 250V Heavy Duty Extension Cord Generator Inlet Box 6 3 8 1 Gauge STW ETL Listed NEMA 14 50P SS2 50R WaterSPEEDWOW 30 FT 50 Amp RV Extension Cord 125 250V Heavy Duty Extension Cord Generator Inlet Box 6 3 8 1 Gauge STW ETL Listed NEMA 14 50P SS2 50R WaterSPEEDWOW 25 FT 50 Amp RV Extension Cord 125 250V Heavy Duty Extension Cord Generator Inlet Box 6 3 8 1 Gauge STW ETL Listed NEMA 14 50P SS2 50R WaterSPEEDWOW 40 FT 50 Amp RV Extension Cord 125 250V Heavy Duty Extension Cord Generator Inlet Box 6 3 8 1 Gauge STW ETL Listed NEMA 14 50P SS2 50R Water
Cord Length20 ft-Out of stock

Key item features

  • Robust Power: This 20 FT 50 Amp RV Extension Cord features a 6/3+8/1 gauge STW ETL Listed cable with 100% pure copper for maximum conductivity, supporting 125/250V and up to 12,500W.
  • Secure Inlet: The kit includes a 50 Amp Generator Inlet Box with an SS2-50P three-prong plug, four pre-drilled mounting holes, and dual-side cable entry for easy installation and clean wiring.
  • Certified Safety: ETL-certified for reliable and safe outdoor power, the kit includes a safety indicator light on the inlet box and a NEMA 14-50P to SS2-50R configuration.
  • All-Weather Durability: Rated IP68 waterproof, the cord has a dual-layer STW sleeve and flame-retardant PVC jacket, while the inlet box is anti-rust coated with a twist-lock connector and flip-cover design.
  • Ergonomic Handling: An ergonomically shaped handle provides a comfortable, secure grip for easier plugging and unplugging, reducing strain and enhancing durability.
  • Flexible Storage: Made from tough, flexible materials that resist kinks down to -40F, it includes an adjustable cable winder for neat coiling and tangle-free transport.
  • Versatile Applications: Ideal for emergency backup, RV hookups, camping, yacht power, and job sites, providing stable, high-output electricity for various outdoor needs.
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Specs

Vehicle fitment type, UniversalBrand, SPEEDWOWMaterial, Constructed with entirely copper, 6/3 + 8/4-gauge wires for superior conductivity.Color, YellowVehicle type, Recreational VehicleRec. use, RV

About this item

Product details

SPEEDWOW 50-Amp RV Power Extension Cord & Inlet Box Kit – Your Ultimate Outdoor Power Solution. Engineered for heavy-duty use, this ETL-certified kit features a high-conductivity 100% copper cable and a weather-resistant inlet box, ensuring reliable power delivery for RVs, generators, camping, and emergency backup. Built to withstand harsh conditions with its all-weather durability, ergonomic handle, and tangle-free storage design, it provides safe, convenient, and continuous electricity wherever your adventures take you.

Specifications:

Product Length: 20 FT

Max Current: 50A

Color: Yellow

Voltage: 125V / 250V

Female Plug: NEMA SS2-50R

Male Plug: NEMA14-50P

Max Power: 12500W

Wire Gauge: STW 6/3 + 8/1 AWG

Operating Temperature: -40°F to 140°F

Net Weight: 18.2 lbs

Inlet Box Internal Space Size: 3.1 in

Inlet Box Material: PVC

Cabinet Type: NEMA 3R Max

Package Dimensions(L x W x H): 14.4 x 14 x 7.48 in

Package Content:

1 x RV Extension Cord

1 x Adjustable Cable Winder

1 x Manual

1 x Warning Label

1 x Power Inlet Box

6 x Screws

6 x Screw Fastening Sleeves

  • ➤【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.
info:
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Specifications

Vehicle fitment type

Universal

Brand

SPEEDWOW

Material

Constructed with entirely copper, 6/3 + 8/4-gauge wires for superior conductivity.

Color

Yellow

Warranty

Warranty information

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Customer ratings & reviews

4.5 out of 5 stars
stars
113 ratings34 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars76% (86)
  2. 4 stars12% (14)
  3. 3 stars4% (4)
  4. 2 stars4% (4)
  5. 1 star4% (5)

Reviews summary

Pros

  • : The product delivers strong benefits relative to its price.
  • : Materials and construction appear consistent.

Neutral

  • : Setup varies from simple plug-in wiring to complex hardwired installs.

Cons

  • : The connector fails to seat and the center pin protrudes.
Generated by AI
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
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Showing 1-3 of 34 reviews

Sep 28, 2025
Reviewer name: Michael
Item details
Cord length: 15 ft
Color: Yellow 50A+PC Box
Sold bySPEEDWOWDelivered byWalmart
5 out of 5 stars
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
Dec 24, 2025
Reviewer name: thomas
Item details
Cord length: 10 ft
Sold bySPEEDWOWDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

this is heavy duty and works great

Helpful?5LNZYHM659NQ7162410134
Mar 4, 2025
Reviewer name: Bowshootga
Item details
Size: 15'
Color: Black+Yellow 50Amp
5 out of 5 stars
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
Current price is Now $84.31
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was $189.99
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