(7 customer reviews)


SKU: SP-ST-21 Category:



  • Fits Sprinter Factory Spare tire location.  NO extra hardware required.
  • Tank can be used for fresh or grey water
  • 21 Gallon Tank
  • Overall dimensions: 24″ W x 28″ L x 10″ H.
  • BPA Free, food grade plastic.
  • Tank has (1) 1.5″ NPT port and (2) 1/2″ NPT ports on driver side.
  • Tank has (1) 1.5″ NPT port and (1) 1/2″ NPT port on passenger side.
  • (1) 1.5″ NPT port and (1) 1/2″ NPT port on top that can be used for float sensor or vent.
  • ***Please allow up to 10 days for processing. ***
  • RETURNS are accepted if the tank has not been installed or altered in any way.  The tank will need to be shipped back in the box purchased in and tracking information provided.  $25 restocking fee.  Customer is responsible for return shipping.
  • Made in the USA

The 21 gallon Sprinter spare tire tank is designed to fit the factory location using only the factory hardware and holder.  No other hardware is needed.  Tank fits Mercedes Sprinter 2500 2007-present and Winnebago Revel.

Item is shipped from Bellingham Wa, 98225.

Additional information

Weight 30 lbs
Dimensions 30 × 24 × 10 in


  1. Daniel Schiel (verified owner)

    Literally the perfect tank solution. We are using the 21gal tank for grey water and mounting the tank couldn’t have been easier

  2. John Heuerman (verified owner)

    Fits like a dream. Solid and sturdy. Now I just need to figure out where I’m going to put the spare tire 😛

  3. Josh P. (verified owner)

    Tank is solidly constructed and a perfect fit for the tire basket. Definitely the easiest way to add a water tank to the underside of a Sprinter.

  4. Wendell (verified owner)

    Tyler was exceptionally helpful and responsive!

  5. Mark (verified owner)

    Perfect holding tank for a Sprinter van. I couldn’t find a good tank solution until I ran across this one. Fits perfectly, with pre-tapped holes just where I needed them.

  6. Ilya Komarov (verified owner)

    This tank is excellent for a waste tank solution for a 2020 sprinter 3500xd conversion van, worked for me👌!

    • TylerNW2020 (store manager)

      Glad the spare tire SP-ST-21 tank worked out for your build! Thank you

  7. Paige Smiley

    Love it! I felt like this was a huge splurge for me and was worried I made a bad decision until I received it… I just didn’t have the room inside for a water tank, and knew I’d have to buy a tire carrier if I bought this tank. Just got the tank in and WOW! Super rigid side walls and quick install. My favorite water tank yet! So glad I made the call to do it 😉

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