Ford Transit 20 Gallon Undercarriage Water Tank

Built to maximize under-van storage, this 20-gallon tank fits cleanly along the driver-side frame rail of the Ford Transit—providing reliable fresh or grey water capacity without sacrificing interior space. Designed for durability, simplicity, and seamless integration with your van’s layout.

Fitment

Ford Transit (Driver-Side Undercarriage, Next to Fuel Tank)
Does NOT fit Transit 130” wheelbase
May NOT fit vans equipped with rear passenger heater or AC lines
- If clearance is tight, the NWC-NWT0239 tank may be a better option
Compatible with fresh or grey water setups
Works with all Transit roof heights (as long as undercarriage layout matches requirements)

Key Features

Undercarriage Space Optimization

Mounts along the driver-side frame section beside the fuel tank, freeing up valuable interior space while adding 20 gallons of onboard water capacity.

Food-Safe & Durable Construction

BPA-free, food-grade polyethylene
IAPMO TS-4 certified
Corrosion-proof and impact-resistant
Suitable for potable or grey water use

Smart Port Layout

(2) 1.5" NPT ports
(2) 1/2" NPT ports on end
(1) 1.5" NPT port on top (for vent, fill, or level sensor)
Tank is not pressurizable and must be vented

Complete Mounting System

Includes:

(3) stainless steel laser-cut mounting straps
Stainless steel 3/8" hardware
3/8" rivnuts

Installation notes:

Requires drilling (3) new 17/32" holes for rivnuts near the pinch weld
Other strap side reuses the factory fuel tank strap bolt location
Rivnut tool required (not included)

Dimensions

Capacity: 20 gallons
Length: 45"
Height: 8.5"
Width: 12.75"

A Clean, Efficient Water Solution for Your Transit Build

The 20 Gallon Ford Transit Undercarriage Tank is engineered for builders who want maximum water storage with minimum interior footprint. Strong, secure, and tailored for the Transit chassis, it’s the ideal upgrade for van conversions, campers, mobile businesses, and overland rigs.