19 gallon stainless steel undermount water tank with mounting bracket and ports

Stainless water tank installed under a Mercedes Sprinter beside the fuel tank

Inlet and outlet ports on the stainless undermount water tank

Top ports on the stainless undermount water tank

Mounting location under the Mercedes Sprinter crew window on the driver side

Tec Vanlife USA

19 Gallon Undermount Stainless Steel Water Tank for Sprinter & Transit

~~$620.00~~ $525.00 Save 15%

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Product variants

19 gallons under the floor, not in your cabinets.

This 304 stainless steel tank mounts under the van beside the fuel tank, freeing interior space for storage and furniture. Two internal baffles keep the water from surging when you brake or accelerate.

Fits: Mercedes Sprinter or Ford Transit (choose your variant), driver side beside the fuel tank, below the crew window and behind the driver seat. Reach out to confirm your model year and wheelbase.

About 19 gallons usable (19.93 gal / 75.46 L gross)
304 stainless steel, 1.5 mm thick, welded
Two internal baffles to control sloshing
Three 5 mm stainless mounting brackets included
Inlet, outlet, drain and vent ports

Choose your variant: Sprinter or Transit mounting.

Pressurize it with the SEAFLO 33 Series Water Pressure System.

See it on your van. Add the 19 Gallon Undermount Stainless Steel Water Tank for Sprinter & Transit to your build in our 3D Van Builder and preview it on a real Sprinter before you buy.

Product Details

Why an undermount tank

Water is heavy and bulky. Moving 19 gallons outside the living area frees a cabinet's worth of space and keeps the weight low.

The welded stainless shell and two internal baffles are built for life under a van, and the baffles keep water from piling to one end when you brake.

What you get

19 gallon 304 stainless steel tank
Three 5 mm stainless mounting brackets

Good to know

Built by Tec Vanlife.
Plumbing fittings and hoses aren't included.

Fitment & Compatibility

Fits: Mercedes Sprinter or Ford Transit (choose variant), driver side undermount

Not sure your build qualifies? Reach out to our team.

Specifications

Capacity	About 19 US gal usable (19.93 gal / 75.46 L gross)
External size	43.31 x 12.60 x 8.66 in (1100 x 320 x 220 mm)
Internal size	43.19 x 12.48 x 8.54 in (1097 x 317 x 217 mm)
Material	304 stainless steel, 1.5 mm
Baffles	2 internal stainless dividers
Ports	Inlet and outlet 1 1/2 in, drain 1/2 in, vent
Brackets	3 stainless, 5 mm thick
Weight	32 lb (14.5 kg) empty; about 190 lb full
Location	Driver side, beside the fuel tank, under the crew window
Fits	Mercedes Sprinter or Ford Transit (choose variant)

What's in the Box

19 gallon 304 stainless steel water tank
3 stainless mounting brackets, 5 mm

DIY FriendlyIntermediate

The tank bolts up under the driver side using the three included stainless brackets, then plumbs into your system through the inlet, outlet, drain and vent ports. The manufacturer doesn't publish an install manual; Reach out to our team at products@sandyvans.com or (619) 812-1903 with questions or to book a shop install in San Diego.

Mistakes to avoid

Ordering before checking clearance with other underbody gear
Skipping the vent line; the tank needs to breathe when filling and draining
Leaving it full through a hard freeze

Tools You'll Need

Floor jack
Socket set
Plumbing fittings and hose for your system

See all Sandy Vans install videos & manuals →

How to choose a van water tank

1. Fit

Undermount tanks are shaped for a specific van and spot.

How to choose: Match the variant to your van and confirm the year with us.

2. Inside or under

Underbody tanks free interior space but face the weather.

How to choose: Short on cabinet space? Go under. Camping below freezing a lot? Plan heating or draining.

3. Capacity

Most travelers use a few gallons a day for drinking, cooking and quick rinses.

How to choose: 19 gallons suits weekend to week-long trips between refills.

4. Material

Stainless steel resists corrosion and impact under the van.

How to choose: For a tank you'll see road spray on, stainless is a durable pick.

Before you order

Confirm van, year and wheelbase
Check for existing underbody tanks or an aftermarket fuel tank
Plan your pump, fill and drain lines

How this tank stacks up

Fit: Sprinter or Transit, driver side
Capacity: about 19 usable gallons
Build: 1.5 mm 304 stainless, two baffles
System: pair with the SEAFLO 33 Series Water Pressure System

How much water does it hold?

The shell holds 19.93 gallons. The two internal baffles take up some of that, so plan on about 19 usable gallons.

Where does it mount?

Under the van on the driver side, beside the fuel tank, below the crew window and behind the driver seat.

Sprinter or Transit?

Pick the variant for your van; the mounting differs between the two.

Will it fit my model year?

Reach out to our team with your year and wheelbase and we'll confirm before you order.

I already have an underbody tank or aftermarket fuel tank. Will it fit?

Reach out before ordering so we can check clearance with what's already under your van.

How heavy is it full?

About 190 lb: roughly 158 lb of water plus the 32 lb tank.

What about freezing weather?

Any underbody tank is exposed to outside temperatures. Plan to drain it or add tank heating if you camp below freezing.

How does shipping work on this item?

This item ships direct from the manufacturer, Tec Vanlife. Shipping is calculated at checkout for your address and may arrive separately from other items in your order.

Do you install products for customers?

Yes. Many SV products can be professionally installed at our San Diego shop. Reach out to our team to schedule. Email products@sandyvans.com or call 619-812-1903.

What is your shipping and return policy?

Most SV products ship free. For returns, see our Returns & Refunds policy or reach out to our team at products@sandyvans.com.

Can I reach a real person with questions?

Always. We are a small team in San Diego. Email products@sandyvans.com or call 619-812-1903 and you'll get a real answer, not a chatbot.

Where are you located?

9393 Trade Pl, San Diego, CA. Come visit the shop, we'd love to show you around.

Does Sandy Vans offer financing?

Yes. Many financing options are available. Set up a call with a sales associate to learn more.

Still have a question? Email the team and you'll get a real answer.