Conntek RV generator adapter L14-20P to 14-50R — 1.5-ft lighted pigtail, 125/250V up to 5,000W

The Conntek 15875 is a compact 1.5-foot RV-to-generator adapter that converts a NEMA L14-20P 20A locking plug to a NEMA 14-50R 50A receptacle for safe 125/250V transfer up to 5,000 watts.

This adapter is designed to bridge smaller generator outlets to larger RV shore power inlets when you need temporary compatibility on the road, at a campsite, or during emergency use. Conntek engineered the cord with an ergonomic grip, two LED indicators for quick power confirmation, and durable components that meet UL/C-UL safety listings. It’s a short, rugged pigtail meant for occasional connection tasks where portability and clarity about live power are important.

How will this adapter help me connect my RV to a generator?

The Conntek 15875 lets you plug an RV that expects a 50A 125/250V inlet into a generator output that uses the L14-20 20A locking configuration. It routes all three conductors plus ground so the RV receives split-phase power at reduced maximum load. Use it when you have no direct 50A generator outlet but need to power essential circuits.

• Converts NEMA L14-20P (20A locking) to NEMA 14-50R (50A socket)
• Provides 125/250V split-phase wiring with grounding
• Rated for up to 5,000 watts (when supply permits)
• 1.5-foot length for tight, portable setups

Is the adapter safe and how do I know it’s powered?

Safety features include UL and C-UL listings for the plug, connector, and STW jacketed cord, plus a molded ergonomic grip that makes insertion and removal easier. Two built-in LEDs give immediate visual confirmation of incoming power so you can verify connection before turning appliances on.

• UL and C-UL approvals for key components
• Two LED power indicators for quick status checks
• Ergo-grip molded handles to reduce strain when unplugging
• STW-jacketed cable for flexible, weather-tolerant use

What are the physical specs and limitations I should be aware of?

The cord is a short 1.5-foot pigtail built to carry up to 20 amps from the generator side and deliver that supply to a 50A-style inlet. That means although the connector fits a 50A receptacle, the available power is limited by the generator’s 20A circuit. This adapter is intended for temporary or limited-load situations, not to upgrade a power source.

• Length: 1.5 feet — compact and portable
• Electrical: NEMA L14-20P (20A, 4-prong locking) to NEMA 14-50R
• Voltage: 125/250V split-phase; max usable wattage ~5,000W depending on supply
• Not a means to increase a generator’s capacity — load must remain within generator limits

Who is this for? If you own an RV or trailer with a 14-50 inlet but only have access to a generator or outlet using the L14-20 20A locking connection, the Conntek 15875 is a convenient, portable solution for getting basic split-phase power to your vehicle. It’s best suited to campers, weekenders, service technicians, and anyone who needs a short, certified adapter to make temporary power connections safely and visibly. It’s not intended to bypass electrical ratings — always match loads to your generator’s capability and local codes.