I bought Class A Customs UM-2000 Water Tank as part of my camper van equipment.
The under-mount tank belongs with the water-system purchases that relate to my early plan for three tank openings.
Tank Shape Before Enclosing the Interior
I used SketchUp to plan the interior and put body openings ahead of the framing, floor and wall panels.
My Interior Preparation notes included the shower drain and openings for three water tanks in that preparation sequence.
I removed cargo tie-down hardware for later framing mounts and door trim for the later insulation and paneling.
The cargo floor during my preparation session before sound deadening.Removing stuck-on residue during the floor cleanup.
My Takeaway for the Build
My Interior Preparation plan included openings for three water tanks while the body was still accessible. The UM-2000 purchase makes tank packaging a concrete comparison: the alternatives also hold twenty gallons but use a rectangular body or a wheel-well recess. Equal capacity therefore leaves important differences in shape and connection placement.
Product Details And Van-Build Uses
Specification
Product Detail
Model
UM-2000
Capacity
20 gallons
Body Dimensions
48 × 13 × 8.5 in, ±0.25 in; fittings excluded
Installed Ports
Two 1.5 in FNPT and two 0.5 in FNPT
The UM-2000 is a long, shallow under-mount-style tank in Class A Customs’ fresh/gray-water range. Its body measurements exclude the fittings, so a van layout also needs room for the connected plumbing and mounting arrangement. The manufacturer lists two larger and two smaller threaded ports, which helps organize the intended fill, outlet, drain and vent routes on a drawing. This is a non-pressurized tank that requires venting during filling and emptying. Its twenty-gallon capacity describes storage volume; it does not establish a vehicle-specific mounting fit. The linked tank list provides model dimensions alongside the other under-mount sizes.
Do The Listed Body Dimensions Include The Fittings?
No. Class A Customs states that tank dimensions exclude the fittings and allow a manufacturing tolerance of a quarter inch.
Alternative products
Two Alternatives to Compare
The T-2000 uses a different tank shape from the UM-2000. TORVA's wheel-well design changes the packaging again, showing how equal nominal capacity can occupy very different spaces.
Product
What distinguishes it
Purchase link
Class A Customs UM-2000 Water Tank
Twenty-gallon under-mount tank with molded connections.
