When your RV's fresh water system needs a reliable, long-lasting tank, the Alpha 18 Gallon RV Fresh Water Tank VR304565WBLANK delivers OEM-grade performance in a uniquely flat, wide-footprint design. At just 6 1/2" deep with a 45" x 30" base, this tank fits where taller tanks simply can't — making it the go-to solution for under-floor RV bays, horse trailers, and marine applications with tight vertical clearance.

Features & Specifications

• Capacity: 18 gallons of potable fresh water storage
• Dimensions: 45" x 30" x 6 1/2" — ultra-low-profile design for tight-clearance installs
• Part Number: VR304565WBLANK
• Material: FDA-approved, food-grade polyethylene — safe for drinking water
• Construction: Seamless one-piece rotational molding — zero seams, zero leak points
• Fittings: Blank tank (no pre-drilled holes) — fully customizable for your plumbing layout
• Finish: Stain, corrosion, and rust resistant — built for years of reliable service
• Weight: 52.86 lbs
• Compatibility: RVs, travel trailers, motorhomes, horse trailers, marine vessels

Why Choose the Alpha VR304565WBLANK?

Most factory-installed RV fresh water tanks are adequate at best. The Alpha 18 gallon RV fresh water tank VR304565WBLANK is engineered to exceed OEM standards — not just meet them. Its seamless rotational-molded construction eliminates the weak points that cause leaks in lesser tanks, while the FDA-approved polyethylene ensures every drop of water stored is safe for drinking.

The blank tank design gives you complete control over your plumbing configuration. Whether you're doing a direct OEM replacement or a custom install, you drill your own fittings exactly where your system requires. No compromises, no adapters.

The low-profile 6 1/2" depth is the standout feature of this Alpha fresh water tank — it slides into under-floor bays and compartments where standard tanks won't fit, making it a favorite for slide-in replacements on older RVs and custom horse trailer builds.

Compare Alpha Fresh Water Tanks

Not sure if the 18-gallon is the right size for your rig? Compare the full Alpha lineup to find your perfect fit:

💡 Tip: When choosing a tank, always measure your available bay space (length, width, AND height clearance) before ordering. The VR304565WBLANK's 6 1/2" height makes it ideal when vertical space is the limiting factor.

Technical Specifications

• Capacity: 18 gallons (68.1 liters)
• Length: 45"
• Width: 30"
• Height: 6 1/2" (6.5")
• Weight (empty): 52.86 lbs
• Part Number: VR304565WBLANK
• Material: FDA-approved food-grade polyethylene
• Manufacturing Method: Rotational molding (seamless one-piece)
• Fittings: None pre-installed (blank tank)
• Color: Natural/White
• Certifications: FDA-approved for potable water storage
• Applications: RV, travel trailer, motorhome, horse trailer, marine vessel

What's Included

• 1x Alpha 18 Gallon Fresh Water Tank (VR304565WBLANK)
• Blank tank — no fittings pre-installed (drill your own to match your plumbing)
• Manufacturer warranty against defects in materials and workmanship

Compatible Models & Related Products

Looking for a different size or a tank with pre-installed fittings? Browse the full Alpha fresh water tank lineup:

• Alpha 10 Gallon RV Fresh Water Tank - 384BLANK — compact option for small rigs
• Alpha 16 Gallon RV Fresh Water Tank - 385BLANK — popular mid-size replacement
• Alpha 22 Gallon RV Fresh Water Tank - VR182611WBLANK — step up in capacity
• Alpha 26 Gallon RV Fresh Water Tank - VR17449WBLANK — wide flat profile, more capacity

Frequently Asked Questions

Is the VR304565WBLANK safe for drinking water storage?
Yes. This tank is made from FDA-approved food-grade polyethylene, making it fully certified for potable (drinking) water storage in RVs, trailers, and marine applications.

Does this tank come with fittings pre-installed?
No — this is a blank tank with no pre-drilled holes or fittings. This gives you full flexibility to drill and install fittings exactly where your plumbing system requires.

How do I install the Alpha VR304565WBLANK in my RV?
Measure your bay opening to confirm the 45" x 30" x 6 1/2" dimensions fit. Drill your inlet, outlet, and vent holes using a hole saw sized for your fittings, install tank fittings with appropriate sealant, and connect to your existing plumbing lines.

What RV brands is this tank compatible with?
This is a universal blank tank compatible with any RV, travel trailer, motorhome, horse trailer, or marine vessel that can accommodate its 45" x 30" x 6 1/2" footprint. Always verify your bay dimensions before ordering.

Why is the VR304565WBLANK so flat compared to other 18-gallon tanks?
The wide 45" x 30" base spreads the 18-gallon capacity across a large, shallow footprint — ideal for under-floor bays with limited vertical clearance. If you have more height available, the 22-gallon VR182611WBLANK may offer a better fit.

Where can I buy an authentic Alpha VR304565WBLANK?
ElkhartRVParts.com is an authorized Alpha Systems dealer. Purchasing here guarantees you receive a genuine OEM-grade part backed by the manufacturer's warranty.