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Description
Promaster Wheel Well Water Tank (22 Gallon)Save valuable space with our Ram Promaster Wheel Well Water Tank. Extra storage is key when it comes to life on the road, and that is where this nifty freshwater tank comes in. Designed exclusively with efficiency in mind, these water tanks utilize that awkward area around your wheel well that often gets wasted The tank also acts as additional soundproofing when it comes to road noise. Holding 22 gallons of freshwater goodness, these water tanks are
Save valuable space with our Ram Promaster Wheel Well Water Tank. Extra storage is key when it comes to life on the road, and that is where this nifty freshwater tank comes in. Designed exclusively with efficiency in mind, these water tanks utilize that awkward area around your wheel well that often gets wasted The tank also acts as additional soundproofing when it comes to road noise.
Holding 22 gallons of freshwater goodness, these water tanks are custom-designed to fit around the Promaster’s wheel well. They can also be used in Sprinters and Transits, with a little extra room around the wheel well, which can be easily be filled with insulation.
If you're looking for more volume, check out our 32 Gallon Wheel Well Water Tank!
Need a grey water tank? Bundle your freshwater wheel well tank with our 15 Gallon Promaster Undermount Tank! The undermount tank fits snugly under the passenger side of your Promaster’s framed undercarriage; the perfect solution for your off-grid water requirements.
Key Features & Benefits:
- Space Saving - A unique way to make efficient use of that awkward wheel well area and shape.
- Perfectly Shaped - Not only do these tanks mold to the shape of your wheel well but the top and outside are also squared off to account for further building. Last we checked, it’s easier to build a square box than a round one.
- Build Options - Option to choose a passenger or driver side tank - whichever wheel well works best for your build. Need more water? Choose both and place one on either side of your van for mega-volume!
- Distributes Weight - Adds weight over your rear axle to help increase traction if you get in a sticky spot. No more slips and skids, not to mention unwanted wheel wear, thanks to the perfect weight distribution of these tanks.
- Sound Proofing - When it comes to road noise, these tanks step it up with added noise reduction around your wheel well.
- BPA-Free and Food Grade Approved - Feel safe knowing these tanks are food grade CSA approved! Wash the dishes, have a shower, fill the dog bowl, and stay hydrated, while exploring in your van!
- Fittings Kit Add-On Available - Save yourself the headache and multiple trips to the plumbing store when you bundle this tank with our Freshwater Fittings Kit!
- Strapping Kit Add-On Available - Weather-resistant strapping crafted from heavy-duty 1/8" thick, 1 1/2" wide aluminum. Simple and secure!
- Water Level Sender & Gauge Kit Add-On Available - This water tank has a fitting specifically designed for use with the KUS S5U Water Level Sender!
- Compatible - Pairs well with our 15 Gallon Promaster Undermount Water Tank.
Dimensions & Specifications:
Designed for the Ram Promaster 136", 159" & 159" extended wheelbases.
Compatible with the Mercedes Sprinter & Ford Transit, all wheelbases.
Tanks are made from linear low-density polyethylene.
Food grade CSA approved and BPA free - safe for freshwater use.
22 US Gallons / 83.2 Litres
42.5” x 13” x 19” (Length x Width x Height)
1 x 1 ½” drill-out membrane port (on top at one end)
1 x 1 ¼" drill-out membrane port (on top at one end)
1 x 1 ¼" drill-out membrane port (on side rear end)
1 x ¾" port (on side rear end)
2 x ½” ports (on side rear end)
1 x ½” ports (on side front end)
All ports are NPT female-threaded.
Tank can be placed on either the PASSENGER SIDE or DRIVER SIDE of the van.
- Passenger side tank sits 8.5” behind wheel well on passenger side / in front of the wheel well on driver’s side.
- Driver side tank sits 8.5” behind wheel well on drivers side / in front of the wheel well on passenger side.
Fits around the wheel well with or without flooring installed in the van.
Fresh Water Fittings Kit Add-On:
- 1x 1 ¼" PVC 90
- 2x ¾" PVC 90
- 1x ¾" PVC Ball Valve
- 1x ¾" Nipple - 6" long
- 1x ¾" Nipple - 4" long
- 1x ¾" Nipple - 1 ½" long
- 1x ½" Poly Adaptor
- 2x ½" Poly Elbows
- 2x #20 Hose Clamps
- 2x #8 Hose Clamps
- 1x Roll of Teflon Tape
- 1x Fill Port
- 5ft Fill Hose
- 5ft ⅝" ID Vinyl Hose
Aluminum Strapping Kit Add-On:
- Specifically designed for your Promaster Wheel Well Water Tank
- Kit includes 2x Heavy-Duty Aluminum Straps & Aluminum Mounting Hardware
More Information:
Wheel Well & Undermount Water Tank FAQ Sheet
FAQ Sheet for the Promaster Wheel Well Water Tank (22 Gallon)
Unbiased Review of the Promaster Wheel Well Water Tank (22 Gallon)
Full Details of the Fresh Water Fittings Kit Add-On
Select this add-on with your tank purchase and save $$ vs buying separately!
Full Details of the Aluminum Strapping Kit Add-On
Select this add-on with your tank purchase and save $$ vs buying separately!
Check out our Promaster Wheel Well Water Tank (32 Gallon)
Check out our Promaster Undermount Water Tank (15 Gallon)
Install Instructions:
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 4
Rediscoving the Great Qualities of this Pillow (after Originally Rejecting It)
Color: Original White, Size: Queen
I recently 'rediscovered' this pillow... having purchased it a year or so ago, when neck + shoulder issues prevented me from being very happy with *ANY* pillow! Believe me, I tried so many! Back then, after repeatedly adjusting the fill of this COOP queen-size pillow, I ultimately stashed the whole thing in a closet. But now, it has unexpectedly re-entered my life... and I'm finally liking it.
It helps that I've resolved most of the neck + shoulder issues (thanks to a year of PT). Plus. I realized that I had removed way too much fill... leaving about as much support as a pile of gently scrambled eggs. So, now that I'm in much better condition and have added back a lot of fill, I'm finding this pillow quite satisfying... yes, actually good! These days, I wake up each morning with a much happier neck.
I do not. however, use the thick, quilted, zippered outer cover that came with it... as I find that stiffens + firms up the pillow a little too much for my taste. So, on top of the thinner, stretchy, zippered inner cover (also provided with the pillow, to contain the fill,) I've replaced the quilted outer cover with a jersey-stretch, zippered, cotton pillow protector. which is lighter weight and more malleable.
As a person who has been traveling for years—by necessity—with a personal pillow from home, I'm now recognizing the extra advantages of this COOP pillow: For travel, its parts all compress well + easily (while for sleeping, the fill is light + lofty, but also supportive, as long as you don't remove way too much). And the pillow's components all readily come apart, so they can be packed separately...even the stuffing can be separated into smaller zip-lock packets, if needed—meaning there's never a need to squish an entire, impossibly big, somewhat dense pillow into a suitcase (or even a compression sack). Quick + easy to disassemble and reassemble. Really, the COOP can be treated as a build-your-own pillow (remember, I changed out the zippered outer cover and adjusted the stuffing volume to my own prefences). It's not cheap, but these days, remarkably, it's doing the trick for me. So glad I didn't get rid of it.
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Great pillow and company
Color: Crescent White, Size: King
I have a couple of Coop Home pillows and loved them. They are several years old and I was on the search for a replacement. I tried 2 other brands, one cost more and the other cost less. Returned 1 and used the other for a short time before I had to go back to my old Coop pillow. I started looking at crescent pillows and did some research. This type of pillow is great for side and back sleepers. Being a side sleeper I looked into the best rated. Coop Home crescent pillow was not rated #1 but it was close. The top rated pillow cost 2.5 times more and I could not justify paying that. I am happy to report that I am waking up less (before every 1.5-2 hours). It comes with extra fill and I love a very firm pillow so I emailed customer service to see if I could get more filling. This was on the weekend and in 1 day they responded that they would be happy to. Now that is great customer service. I sleep warm and have no problem with a hot head. It comes with a cover but I use silk pillowcases and it works fine. I will say when I first got the pillow it was very thin and flimsy. I had some doubts but followed directions and put in the dryer on low. Came out perfect. Highly recommend this pillow and company.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Best pillow I've ever owned
Color: Cut-out White, Size: Queen
While the pillow looks anemic when it first comes out of its packaging, it puffs/firms up beautifully after time in the dryer. I haven't had any odor issues.
I'm mostly a side sleeper and at first I thought there wasn't enough of the extra fill, so I put it all in. I've ended up needing to take at least half back out to keep my head at the correct angle.
While this can fit in a standard pillow case, it just barely fits and keeps coming out - at least at my fill level. Queen pillow cases are much better.
This is so much more comfortable than any of my previous pillows. I don't need to stack multiple pillows to get the right support. I'm no longer waking up with neck or shoulder or arm pain. I'm recommending it to pretty much everyone and I've purchased a second pillow to keep at my parents for when I visit!
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Reviewed in the United States on May 6, 2026
★★★★★ 5
So nice your wife will steal it for herself
Color: Original White, Size: Queen
This, this is the god of all pillows I’ve ever purchased. It’s the perfect balance of firm and soft and it’s easily adjustable using the added filler. I’m a side sleeper so having a primary pillow is a must. Combined with a decent secondary pillow this one provides a perfect amount of support. This pillow is so nice, my wife ‘borrowed it’.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Favorite pillow!!
Color: Original White, Size: Queen
Absolutely love this pillow! Bought my husband one a year ago after he was waking up with neck pain. Just recently bought myself one, we both love them! Very comfy and comes with a bag of extra foam to add/remove from the pillow. The zipper on the side of the pillow cover is hidden but durable. We take it with us wherever we go, and always sleep so good.
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Reviewed in the United States on May 30, 2026
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