Which Nexus RV models does The RV Fuel Vault fit?

The RV Fuel Vault fits the Nexus Viper Class C motorhome on Ford E-450 chassis.

Does the Nexus Viper have an exposed fuel cap?

Yes. The Nexus Viper on Ford E-450 has an exposed fuel cap on the driver side with no factory security.

How do I order the right door for my Nexus Viper?

Use the Fitment Finder on our homepage and select the Ford E-450 chassis to find the correct RV Fuel Vault for your Nexus Viper.

The RV Fuel Vault^™

Fuel Cap Security for Your Nexus RV Viper

Purpose-built for the Nexus Viper Class C on Ford E-450 chassis

The RV Fuel Vault — RV fuel cap cover, fuel hatch cover and gas cap hatch for Super C and Class C motorhomes

The Problem

✖Your Nexus Viper has exposed gas caps with zero security
✖Generic locking gas caps don’t fit the E-450 filler neck properly
✖Fuel theft and contamination are real risks at campgrounds and overnight stops
✖No factory fuel cap security exists for Nexus RV models

The Solution

Engineered specifically for Nexus RV Viper on Ford E-450 chassis
High-strength fiber-filled polymer with tamper-resistant keyed lock
Bolt-on install in 8–15 minutes — no modifications needed
Made in USA with Limited Lifetime Warranty and free shipping

Frequently Asked Questions

Locking Fuel Door for Nexus RV

The Nexus Viper is a popular Class C motorhome on the Ford E-450 chassis. The RV Fuel Vault provides the locking fuel door security that Nexus did not include from the factory.

Order Today — Starting at $139.95

Single Door, Set of 2, or 3-Pack · Free shipping · Limited Lifetime Warranty · 30-day guarantee

Order Now

Proudly Made in the USA · Patent Pending