NW Conversions 20 Gallon Galley Water Tank (Fresh or Grey)
20 Gallon Universal RV & Van Water Tank – 16" x 16" x 18"
Increase your onboard water capacity without sacrificing valuable interior space. The NW Conversions 20 Gallon Galley Water Tank is engineered for van conversions, RV cabinetry, truck campers, and compact mobile builds that require reliable fresh or grey water storage in a clean, space-efficient design.
With a 16" x 16" footprint and 18" height, this tank fits seamlessly inside galley cabinets, bench seating, storage compartments, and custom interior cavities in Mercedes Sprinter, Ford Transit, and Ram Promaster builds. It can be configured to drain directly through your subfloor with a ball valve or connected to an external undermount tank for expanded grey water capacity.
Made in the USA from BPA-free food-grade polyethylene and certified to industry standards, this 20-gallon tank is built for durability, safety, and long-term road use.
Designed for Compact Van & RV Water Systems
This universal rectangular water tank is ideal for builders who need higher capacity while maintaining a clean, professional installation.
Perfect for:
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Camper van sink systems
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Shower drain systems
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Fresh water storage tanks
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Grey water collection tanks
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RV cabinetry installations
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Truck camper conversions
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Tiny homes on wheels
Key Features
Space-Saving Rectangular Design
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Compact 16" x 16" x 18" dimensions
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Fits inside galleys, cabinets, and bench seating
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Easy to secure and frame
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Optimized for tight interior layouts
Fresh or Grey Water Compatible
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Safe for potable fresh water storage
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Suitable for grey water systems
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Designed for gravity drain configurations
Certified & Safe Construction
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Rotomolded from BPA-Free Food Grade Polyethylene
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IAPMO TS 4 Tested and Certified
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TEI Listed
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RVIA+ Certified
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Made in the USA
Versatile Plumbing Configuration
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Pre-installed 1/2" NPT fitting
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Pre-installed 1.5" NPT fitting
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Compatible with fill lines, 12V water pumps, vents, and sensors
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Supports subfloor drain or external grey tank integration
Lightweight & Durable
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Weighs only 16 lbs empty
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Built to withstand vibration and off-grid travel
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Impact-resistant polyethylene construction
Flexible Installation Options
This 20-gallon water tank can be configured to:
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Drain directly through the subfloor with a ball valve
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Connect to an undermount grey water tank for expanded capacity
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Serve as a standalone fresh water supply tank
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Integrate into sink or shower plumbing systems
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Support water level sensor installation
Important: Tank must be properly vented and is designed for gravity fill systems only. Do not pressurize.
Technical Specifications
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Capacity: 20 Gallons
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Dimensions: 16" L x 16" W x 18" H
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Weight: 16 lbs
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Material: BPA-Free Food Grade Polyethylene
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Certifications: IAPMO TS 4, TEI Listed, RVIA+ Certified
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System Type: Gravity Fill / Vented (Do Not Pressurize)
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Application: Fresh or Grey Water Storage
Vehicle & Platform Compatibility
Compatible with virtually any RV or mobile platform, including:
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Mercedes Sprinter
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Ford Transit
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Ram Promaster
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Truck campers
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Travel trailers
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Box trucks
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Tiny homes
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Custom off-grid builds
Frequently Asked Questions
Can this tank be used for fresh drinking water?
Yes. It is made from BPA-free food-grade polyethylene and certified for potable water use.
Can it also be used as a grey water tank?
Yes. It works well as a compact grey water collection tank inside cabinetry.
Is the tank pressurizable?
No. This tank is designed for gravity-fill, vented systems only and should not be pressurized.
Does it include fittings?
Yes. It includes pre-installed 1/2" NPT and 1.5" NPT fittings for straightforward plumbing integration.
Increase Water Capacity Without Losing Space
The NW Conversions 20 Gallon Galley Water Tank delivers higher capacity water storage in a compact, cabinet-friendly footprint. Whether used for fresh water or grey water, it provides a certified, durable, and installation-friendly solution for professional upfitters and DIY van builders alike.
