28 Gallon Promaster Wheel Well Water Tank

Optimize Your Van Build with Space-Saving Storage

Transform the often-wasted space around your wheel well into valuable fresh water storage. Designed specifically for the Ram Promaster, this 28-gallon wheel well tank contours perfectly over the wheel housing, allowing you to build your bed or cabinetry flush against the wall without losing interior volume.

While engineered for the Promaster, this versatile tank is also compatible with Ford Transit and Mercedes Sprinterconversions (leaving a slight air gap for insulation), making it a top choice for professional upfitters and DIY builders alike.

Constructed in the USA from durable, BPA-free food-grade plastic, this tank is reversible—it can be installed on either the driver or passenger side. It features multiple NPT ports for flexible plumbing configuration, ensuring a clean and leak-free water system for your sink, shower, or outdoor wash station.

Key Features:

• Wheel Well Design: "Centered" design sits directly over the wheel hump, utilizing dead space to keep your van’s center of gravity low.

• Universal Placement: Can be mounted on either the Driver or Passenger side of the vehicle.

• Safe & Certified: Made from BPA Free Food Grade Plastic for safe drinking water.

• Customizable Fittings:

  • (2) 1/2” NPT ports (open and ready to use).

  • (2) 1.5” NPT ports on ends (Note: These are spun closed and must be drilled out if used).

  • (1) 1.5” NPT top port (Note: Spun closed, needs drilling) perfect for gravity fill or water level sensors.

• Made in the USA: High-quality molding you can rely on for off-grid travel.

Vehicle Compatibility:

• Ram Promaster: Designed for a near-perfect fit over the factory wheel well.

• Mercedes Sprinter & Ford Transit: Will fit securely, though because Promaster wheel wells are larger, there will be a gap around the top of the well—ideal for adding extra insulation or sound deadening.

• Other Vehicles: Can be used in box trucks, trailers, or other custom builds where dimensions allow.

Technical Specifications:

• • Capacity: 28 Gallons

  • Dimensions: 48” (Length) x 14” (Width/Deep) x 20” (Height)

  • Weight: 31 lbs

  • Venting: Gravity fill/vent required (Do not pressurize this tank).