(17 customer reviews)


Out of stock

SKU: SP-ST-21 Category:




  • Fits Sprinter Factory Spare tire location.  NO extra hardware required.
  • Sprinter 170 Ext may have different brackets.  Please confirm before ordering.
  • Dually Sprinter van 3500.  May need to lower brackets or cut spacers from frame.  Dually wheel is narrower in width.  Please measure before ordering.
  • 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.
  • Tank is designed for non pressurised systems.  Needs to be vented.
  • ***Please allow up to 10 days for processing. ***
  • RETURNS are accepted up to 180 Days 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 😉

  8. Bryce (verified owner)

    Just what was needed to increase my fresh water capacity. Quality is perfect as is fit. Pre-purchase email was answered extremely fast as was shipping. Thank you Tyler your a true blessing to the community 😊

  9. John C. (verified owner)

    High build quality. By far the easiest tank to install on a sprinter. I set it up as a grey tank with an electronic ball valve. Works perfectly.

  10. Lukas Van Schalkwyk (verified owner)

    Great product. Needs another 2.5″ at the top of the tank.

  11. Anonymous (verified owner)

  12. Frank Russell (verified owner)

    Well made and fit perfectly in a 2017 170” Ext. Sprinter.

  13. hermann (verified owner)

    Arrived at lightning speed and very well made. Well designed. Must have for your Sprinter build.

  14. greg eiler (verified owner)

    Great way to increase your water storage and the fit was perfect.

  15. Jamie S. (verified owner)

    Not the best threaded home setup, which makes it hard to use this as a grey water tank. It’s also hard to vent properly. Great idea, less than ideal execution.

  16. Phong Tran (verified owner)

    Great tank! Very high quality construction!

  17. KP (verified owner)

    If you have an alternate location for your MB Sprinter’s spare tire, this is a perfect fit product to fully utilize the OEM spare tire bracket and location. This is especially useful when you don’t have a lot of bandwidth to customize a DIY water storage or gray water tank underneath the van. Nicely built and good quality product!

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