tankRO – 6 Gallon RO Water Filtration Expansion Tank with Free 1/4-Inch Tank Ball Valve

Overview

Meet the tankRO 6 Gallon RO Water Filtration Expansion Tank — a compact, reliable storage solution designed to complement your reverse osmosis setup. With a capacity of up to 4.4 gallons, it provides a ready reservoir of filtered water, neatly tucked under most kitchen sinks for a clean, uncluttered space. Built to support consistent water storage, this tank blends practical design with real-world convenience for households that value accessible, high-quality filtered water.

What makes it stand out

Key features come together to create a storage tank that’s easy to live with every day. The tank is made from 100% food-grade materials to help minimize impurities, while deep-drawn steel domes and precision welding contribute to a durable, long-lasting structure. A free 1/4 inch tank ball valve and a 1/4 inch quick-connect design are included for straightforward installation and simple replacements when needed.

What you get and how it helps

• Free tank ball valve for quick setup and reliable connections right out of the box
• 1/4" quick-connect design that simplifies installation and future replacements
• Rigorously tested for durability with a 1-year warranty for peace of mind
• Compact footprint (17.5 x 12 x 12 in) to fit under most kitchen sinks
• Stores up to 4.4 gallons of filtered water for on-demand use

Durability and materials

The tank’s construction emphasizes longevity and safety. Deep-drawn steel domes, precise welding, and materials suitable for contact with drinking water work together to support your RO system’s storage needs without sacrificing performance. The result is a sturdy addition to your filtration setup that stays in place through daily use.

Ideal everyday use

Designed for homes that rely on RO purification, this expansion tank provides a steady reservoir of ready-to-drink water. Its under-sink design keeps your counter space clear, while the reliable valve and connection system minimizes the chance of leaks or drips. While not a medical device, the tank offers a practical way to maintain an on-hand supply of clean water for cooking, beverages, and quick refills.

Specifications at a glance

• Capacity: up to 4.4 gallons
• Dimensions: 17.5 x 12 x 12 inches
• Materials: 100% food-grade components
• Includes: Free 1/4" tank ball valve
• Warranty: 1 year