28 Gallon Promaster Wheel Well Water Tank (Center)
Maximize Space. Maximize Capacity. Built for Promaster Wheel Wells.
The 28 Gallon Promaster Wheel Well Water Tank is engineered to take full advantage of the large, deep wheel wells found in the Ram Promaster platform. This centered design delivers maximum water capacity while preserving interior layout options for cabinetry, beds, and storage.
Fitment
Designed For:
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Ram Promaster Vans (all wheelbase lengths)
Also Fits:
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Mercedes Sprinter
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Ford Transit
Because Sprinter and Transit have smaller wheel wells, this tank will fit with extra clearance above the wheel well, allowing added insulation if desired.
Placement Options
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Fits either driver or passenger side
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Sits centered over the wheel well for balanced weight distribution
Key Features
High-Capacity Wheel Well Design
Provides 28 gallons of water storage without occupying usable central floor space—perfect for full conversions and off-grid builds.
Durable, Safe Construction
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Made from BPA-free, food-grade polyethylene
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Built for long-term use in mobile environments
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Smooth, easy-to-clean surfaces
Flexible Plumbing Configuration
Ends (Both Sides):
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(2) 1.5" NPT ports (must be drilled out before use)
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*(2) 1/2" NPT ports
Top:
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(1) 1.5" NPT port (must be drilled out) for fill, vent, or level sensor
Vent Required
Tank is not pressurized and must be vented during operation.
Dimensions
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Capacity: 28 gallons
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Length: 48”
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Height: 20”
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Depth: 14”
Why Choose This Tank?
✔ Maximizes storage using wheel well space
✔ Extra-large 28-gallon capacity for off-grid setups
✔ Perfect fit for Promaster wheel wells
✔ Works in Sprinter and Transit with additional insulation room
✔ Strong, food-safe construction designed for van conversions
The 28 Gallon Promaster Wheel Well Tank is the ideal solution for builders who need high-capacity water storage while keeping interior layouts clean, efficient, and spacious.
