25 Gallon Dually Wheel Well Water Tank

A High-Capacity Water Solution for Sprinter & Transit Dually Vans

The 25 Gallon Dually Wheel Well Water Tank is engineered to maximize storage capacity while using space that normally goes to waste—your wheel well cavity. Designed specifically for Mercedes Sprinter 3500 dually and Ford Transit dually vans, this tank provides a large water reservoir without sacrificing valuable floor width inside your build.

Whether you're building a camper, work van, or expedition rig, this tank delivers reliable, high-volume water storage with a clean, efficient fit.

Fitment

Designed For:

• Mercedes Sprinter 3500 Dually (all years)

• Ford Transit Dually (all years)

• Also fits Sprinter T1N and many other van platforms

Additional Fit Notes

• Transit: Slightly smaller wheel wells = extra insulation space

• RAM ProMaster: Requires 3.5" elevation to clear larger wheel wells

• Fits either driver or passenger side, depending on your layout

Key Features

High-Capacity Wheel Well Tank

A full 25 gallons of water storage—ideal for long trips, off-grid builds, or vans supporting multiple passengers.

Optimized Wheel Well Fit

Designed to wrap the wheel arch and reclaim unused space without reducing the usable interior width of your van.

Food-Grade Construction

• Made from BPA-free, food-grade plastic

• IAPMO TS-4 tested and certified for safety

• Suitable for fresh or grey water

Flexible Plumbing Options

Multiple port locations make installation easy, no matter your layout:

• (2) 1.5" NPT ports + (2) 1/2" NPT ports on large end

• (1) 1.5" NPT top port (perfect for fill or level sensor)

• (1) 1.5" NPT port + (1) 1/2" NPT port on wheel-well side

• Tank must be vented—not designed for pressurization

Support Plate Included

Comes with a support plate and mounting hardware for a solid, secure install.

Dimensions

• Capacity: 25 gallons

• Length: 46"

• Height: 20"

• Width: 14"

Why Choose This Tank?

This 25-gallon wheel well tank is ideal when you need:

✔ Maximum water capacity in a compact footprint
✔ A tank designed for Sprinter & Transit dual-rear-wheel vans
✔ An installation that preserves full interior floor width
✔ Certified, safe, and reliable construction

It’s a go-to solution for van builders who want the largest practical wheel well tank available for dually platforms.