SPEEDWOW 40 ft 30 Amp RV Extension Cord with Generator Inlet Box, SJTW 4X10AWG, NEMAL14-30P to 14-30R

SPEEDWOW 40 FT 30 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, SJTW 4X10AWG ETL Listed, NEMAL14-30P to 14-30R, Waterproof Power Cord for RV Outdoor Home

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SPEEDWOW

SPEEDWOW 40 FT 30 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, SJTW 4X10AWG ETL Listed, NEMAL14-30P to 14-30R, Waterproof Power Cord for RV Outdoor Home

|100 ratings

SPEEDWOW 40 FT 30 Amp RV Extension Cord, 125/250V Heavy Duty Extension Cord with Generator Inlet Box, SJTW 4X10AWG ETL Listed, NEMAL14-30P to 14-30R, Waterproof Power Cord for RV Outdoor Home 30 Amp Generator Cord Inlet Box 40FT RV Extension Cord NEMAL14 30P L14 30R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electric 30 Amp Generator Cord Inlet Box 20FT RV Extension Cord NEMAL14 30P L14 30R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electric 20FT 30 Amp Generator Cord Pre Drilled Power Inlet Box Heavy Duty Generator Power Cord 4 Prong 125 250V NEMAL14 30P 14 30R Waterproof ETL Listed Home 30 Amp Generator Cord Inlet Box 25FT RV Extension Cord NEMAL14 30P L14 30R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electric 50FT 30 Amp Generator Cord Pre Drilled Power Inlet Box Heavy Duty Generator Power Cord 4 Prong 125 250V NEMAL14 30P 14 30R Waterproof ETL Listed Home 25FT 30 Amp Generator Cord Pre Drilled Power Inlet Box Heavy Duty Generator Power Cord 4 Prong 125 250V NEMAL14 30P 14 30R Waterproof ETL Listed Home 30 Amp Generator Cord Inlet Box 15FT RV Extension Cord NEMAL14 30P L14 30R Twist Lock Connector 125V 250V Generator Extension Cord RV Camper Electric 15FT 30 Amp Generator Cord Pre Drilled Power Inlet Box Heavy Duty Generator Power Cord 4 Prong 125 250V NEMAL14 30P 14 30R Waterproof ETL Listed Home

Cord Length:40 ft

Actual Color:PVC Box

Key item features

➤【30-Amp RV Extension Cord】Engineered for high-power applications. Maximize conductivity with SJTW 4×10 AWG cable, constructed with 100% pure copper. Equipped with a standard adapter-style NEMAL14-30P male to 14-30R female plug, compatible with most 30A RVs and generators. Its dual-voltage 125/250V design supports up to 7500W 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.
➤【30 Amp Generator Inlet Box】Compatible with all standard NEMA L14-30R 30-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 40ft 30-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 (NEMAL14-30P) 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 SJTW 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.
➤【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.

Specs

Amps
30 Amps
Volts
125 V, 250 V
Features
Adjustable, Waterproof, Durable, With LED Lights, Comfort Grip, Corded, Heavy Duty, Home Backup, Long Cord, Plug-in, Portability, Rubber Grip, Water-Resistant
Fire safety certifications
ETL
Rec location
Indoor and Outdoor
American wire gauge
10

Reviews summary

Pros

: Made with durable and sturdy components.
: Firmly locks into place with this type of connector.
: Provides sufficient extension for various uses.

Neutral

: Offers competitive pricing, but can be expensive for some users.

Cons

: May not match product image or have design variations.

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About this item

Product details

SPEEDWOW 30-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, it provides safe, convenient, and continuous electricity wherever your adventures take you.

Specifications:

Product Length: 40 FT

Max Current: 30A

Color: Yellow

Voltage: 125V / 250V

Female Plug: NEMAL14-30R

Male Plug: NEMAL14-30P

Max Power: 7500 W

Wire Gauge: SJTW 4X10AWG/8AWG~10AWG

Operating Temperature: -40°F to 140°F

Net Weight: 16.1 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): 14.2 x 14.2 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

➤【30-Amp RV Extension Cord】Engineered for high-power applications. Maximize conductivity with SJTW 4×10 AWG cable, constructed with 100% pure copper. Equipped with a standard adapter-style NEMAL14-30P male to 14-30R female plug, compatible with most 30A RVs and generators. Its dual-voltage 125/250V design supports up to 7500W 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.
➤【30 Amp Generator Inlet Box】Compatible with all standard NEMA L14-30R 30-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 40ft 30-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 (NEMAL14-30P) 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 SJTW 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.
➤【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

Amps

30 Amps

Volts

125 V, 250 V

Features

Adjustable, Waterproof, Durable, With LED Lights, Comfort Grip, Corded, Heavy Duty, Home Backup, Long Cord, Plug-in, Portability, Rubber Grip, Water-Resistant

Fire safety certifications

ETL

Warranty

Warranty information

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