We are always striving for better space-saving ideas, and this undercarriage tank is just the ticket! This tank is designed to fit snugly around your Promaster’s framed undercarriage; these tanks are the perfect solution for your off-grid water requirements.
Check Your Layout
Passenger-side undermount installation only. Designed for ProMaster 159-inch and 159-inch extended wheelbases; not compatible with 118-inch or 136-inch wheelbases.
Overall dimensions: 45.5 inches long × 13⅜ inches wide × 8 inches high. Check the tank dimensions against your planned layout before ordering.
Choose Your Add-Ons
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No Kit: fittings kit is not included.
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No Strapping: strapping kit is not included.
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Yes 15 Gallon Strapping: adds the strapping kit listed below.
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Yes Greywater Fittings Kit: adds the greywater fittings kit listed below.
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Yes Freshwater Fittings Kit: adds the freshwater fittings kit listed below.
Composed of high-quality, BPA-free, food-grade approved linear low-density polyethylene, this tank can also function as freshwater storage. We've created a complete Freshwater Fittings Kit that includes everything you need to turn this tank into an undermount freshwater reservoir.
Complete your off-grid water management system by pairing this undermount tank with our 22 Gallon, or our 32 Gallon Promaster Wheel Well Water Tank. Worry less about water management, and spend more time adventuring!
Install Instructions:
Freshwater Fittings Kit Install Instruction
Grey Water Fittings Kit Install Instructions
Strapping Kit Install Instructions for Promaster 15 Gallon Water Tank (Passenger Side)
Key Features & Benefits:
- Save Space - Mount underneath your van chassis for extra storage room inside your van - passenger side only.
- Perfect Fit - Designed to fit perfectly under the Promaster van, simply position the tank and attach with strapping, no need to make modifications.
- Durable Design - This tank is tough; rest assured knowing your tank will hold up to exposure and the elements.
- Multi-Purpose - Use this undermount tank for grey water storage, or bundle it with our Freshwater Fittings Kit and turn this tank into a freshwater reservoir.
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BPA-Free and Food Grade Approved - These tanks are CSA approved and food grade certified for safe drinking water.
- Fittings Kit Add-On Available - Save yourself the headache and multiple trips to the plumbing store when you bundle this tank with our Grey Water Fittings Kit or Fresh Water Fittings Kit!
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Strapping Kit Add-On Available - Weather-resistant strapping crafted from heavy-duty 1/8" thick, 1 1/2" wide aluminum. Simple and secure!
- Compatible - This tank pairs well with our 22 Gallon and 32 Gallon Promaster Wheel Well Water Tanks.
Dimensions & Specifications:
Designed for the Ram Promaster 159" & 159" extended wheelbases.
NOT COMPATIBLE with the 118" or 136" wheelbase.
The tank can only be mounted on the PASSENGER SIDE of your van.
However, your drain hose can be routed to your drivers side if needed.
Tanks are made from linear low-density polyethylene.
Food grade CSA approved and BPA free - safe for freshwater use!
15 US Gallons / 56.7 Litres
45.5" x 13 3/8" x 8" (Length x Width x Height)
1 x 1 ¼" fill port (on right side)
1 x ¾" drain port (on right side)
2 x ½" vent ports (on left side, top of humps)
1 x ½" vent port (on front end, top of hump)
1 x ½" optional water-pump port for freshwater use (on front end, bottom corner)
All ports are NPT female-threaded.
Grey 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
- 3x ½" Poly Adaptors
- 1x ½" Poly Elbow
- 1x ½" PVC Plug
- 2x #20 Hose Clamps
- 3x #8 Hose Clamps
- 1x Roll of Teflon Tape
- 5ft Fill Hose
- 2ft ⅝" ID Vinyl Hose
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
- 3x ½" Poly Adaptors
- 1x ½" Poly Elbow
- 1x ½" PVC Plug
- 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:
- 2x Heavy-Duty Aluminum Straps
- Aluminum Hardware
More Information:
Wheel Well & Undermount Water Tank FAQ Sheet
Full Details of the Grey Water Fittings Kit Add-On
Select this add-on with your tank purchase and save $$ vs buying separately!
Full Details of the Fresh Water Fittings Kit Add-On
Select this add-on with your tank purchase and save $$ 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 (22 Gallon)
Check out our Promaster Wheel Well Water Tank (32 Gallon)
