S7 50Ft 50Amp STW Heavy Duty RV Extension Cord - Weatherproof Locking

In this review the S7 50ft 50Amp STW extension cord is assessed for RV owners who need a long, heavy duty power lead that handles full 50 amp, 125/250V service. The bottom line: this cord is built for reliability and high-load use thanks to 6AWG/3C plus 8AWG/1C wiring, a certified locking SS2-50R connector and a threaded ring for a weatherproof connection, making it a solid choice when campsite power or generator hookup needs a rugged, long reach.

Key Features

• 50 ft length: Provides extended reach from distant pedestal outlets to larger RVs and trailers so you can park where hookups are available without stretching a thin cable.
• 6AWG/3C + 8AWG/1C construction: Heavy gauge copper wiring safely conducts full 50 amp, 125/250V service for appliances and air conditioning without excessive voltage drop.
• Threaded ring locking adapter: The SS2-50R twist-lock female with a threaded ring creates a weatherproof connection that resists accidental disconnects at the pedestal.
• Durable jacket: Flame retardant, heat resistant PVC outer jacket and large diameter build protect conductors and stand up to handling and outdoor use.
• High maximum wattage: Rated for up to 12,500 watts, enabling multiple onboard systems and AC units to run simultaneously without overloading the cord.
• Storage and protection: The included plastic strap and plug protector make it easier to store and keep connectors clean between trips.

Who It's For

The S7 50ft 50Amp STW cord is best for owners of fifth-wheel trailers, motorhomes and larger campers that use a 50 amp inlet and require a long, heavy duty extension to reach park pedestals or a generator. It is especially suitable for diesel motorhome owners and people who regularly run multiple high-draw appliances.

Those who need a lightweight, short run or a 30 amp solution should look elsewhere, as the heavy 6AWG build makes this cord relatively bulky and best suited to situations where full 50 amp capacity and durability matter more than compactness.

Pros & Cons

Pros

• Solid build quality with 100% copper conductors and tough PVC jacket for long service life.
• Reliable locking connection and threaded ring for weather resistance at the inlet.
• Generous 50 ft length gives flexibility at campsites and when connecting to a generator.
• High wattage rating supports multiple onboard systems and air conditioning.

Cons

• Heavier and bulkier than shorter or lower gauge cords, which can make handling and storage more demanding.
• The long, thick cord may be overkill for casual RVers with minimal power needs.

Specifications

Plug type	NEMA 14-50P male
Socket type	SS2-50R twist-lock female with threaded ring
Length	50 ft
Wire gauge	6AWG/3C + 8AWG/1C
Voltage	125/250V
Maximum wattage	12,500 watts
Jacket	Heat resistant, flame retardant PVC

Our Verdict

The S7 50ft 50Amp STW extension cord is a dependable, value-minded choice for RV owners who need full 50 amp capacity over a long run. Its heavy gauge copper conductors, locking female and weatherproof ring give confidence for demanding use, though the cord's weight and bulk mean it is best for owners who prioritize power and durability over compact storage.

Frequently Asked Questions

Will this cord handle my RV air conditioner?
Yes, the 6AWG/3C plus 8AWG/1C construction and 12,500 watt rating are designed to support AC units and other high-draw appliances on a 50 amp service.

Is the connection weatherproof?
The SS2-50R twist-lock female with a threaded ring provides a more weather-resistant, secure connection than a nonlocking plug.

Is this cord easy to store?
It includes a plastic strap and plug protector to keep the cord neat, but its heavy gauge and 50 ft length make it bulkier than lighter cords.