Ram Promaster Undermount Grey Water Tank (15 Gallon)

Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)
Ram Promaster Undermount Grey Water Tank (15 Gallon)

Ram Promaster Undermount Grey Water Tank (15 Gallon)

Rated 5.0 out of 5
Based on 1 review
Regular price $375.00 Sale price $245.00 Save $130
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Features
  • Space Saving
  • Compatible
  • High Quality

Use code PICKUP for 10% off when you choose local pickup at checkout.

In case you were unaware, a lot of our products are designed and sourced by, yours truly, straight outta Canada. We have vans, live in them, often are off-grid, and know the ins and outs of our products. Because of this, we are always looking to improve, for us and you!

One of our most recent projects is the Ram Promaster 15 Gallon Undermount Grey Water Tank. What we are always striving for is better space-saving ideas, and this undercarriage tank is just the ticket! Composed of high-quality plastic and designed to fit snugly around your Ram Promaster’s framed undercarriage while adding weight to your axle, these tanks are the perfect solution for your water needs.

! READ BELOW !

Unfortunately for us, we received our first batch of tanks and test fit one using some steel strapping. The back right corner of the tank is by the slightest margin too tight, while the rest of the tank sits flush against the floor, leaving the corner about an inch away from reaching the top. Now we have to make a slight modification to the mold to get an exact fit!

Note: The current batch of tanks can only be mounted on the PASSENGER side of your van, due to placement of the fitting ports. Drain hose can be routed to the driver side if desired. 

Fortunately for you, we made 30 of these tanks in our first batch and we're happy to sell them at cost. They will still work great mounted as observed in the photos, and you can also add spacers in the corners if need be for your own custom fit. Or, if you'd prefer one from the next batch, just let us know, they'll be out soon!

Key Features & Benefits:

  • Space Saving - Mount underneath van chassis for extra storage room inside your van.
  • Easy and Snug Fit - Designed to fit perfectly under the Ram Promaster around body frame members, no adjusting is needed, simply set in place and attach.
  • High Quality - Made of a plastic composition designed for the durability of your water tank.
  • Compatible - This tank pairs well with our 22-Gallon and 32-Gallon wheel well freshwater tanks so you’ll have to fill up less while out and on the go. 


We appreciate you jumping on this deal and trying out our newest design! If you do get a minute after your installation, we’d also really appreciate any feedback you have. We try them out ourselves, but it’s always helpful to get some added outside perspective from fellow campervan enthusiasts.

Compatible with both the 159 & 159 EXT wheelbase.
Not compatible with the 136 wheelbase.

Strapping not included. We suggest using a galvanized steel slotted strapping with 1/4" rivnuts to secure the tank. Make sure to get stainless, as it will be exposed to moisture. 

15 US Gallons
Length: 3' 9 1/2"
Width: 1' 1 3/8"
Height: 8"
(See photo with dimensions for reference)

No strapping included! Purchase stainless galvanized steel slotted strapping to attach to van undercarriage (found at Rona or similar hardware stores). Use 1/4" rivnut bolts to secure.

average rating 5.0 out of 5
Based on 1 review
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100% of reviewers would recommend this product to a friend
Review posted
Reviewed by Julien P.
Verified Buyer
Rated 5 out of 5

Tank for Promaster 3500

Perfect 10/10

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