Description
Product Overview
The tankRo RO132-TNK 4‑gallon expansion tank is engineered to complement under‑sink reverse osmosis (RO) filtration units, delivering a reliable reservoir of purified water that is ready for immediate consumption. Constructed from deep‑drawn steel with precision welding, the tank provides a robust, leak‑free container that can withstand the pressures typical of residential water systems up to 100 psi. The NSF‑certified design guarantees that the stored water meets stringent health and safety standards, ensuring that it remains free from contaminants and off‑flavors.
With a compact footprint of 15 × 12 × 12 inches, the tank fits comfortably beneath most kitchen sinks while offering a usable capacity of approximately 3.2 gallons, delivering a steady flow of filtered water even during peak demand. The included 1/4‑inch ball valve with quick‑connect fitting simplifies installation and future maintenance, allowing homeowners to replace or upgrade the tank without specialized tools. The tank’s internal diaphragm separates the air charge from the water, maintaining consistent pressure and preventing water hammer, which contributes to a smoother operation of the entire RO system.
Every unit undergoes rigorous quality control testing, including pressure cycling, leak detection, and durability assessments, to ensure that each tank performs reliably over its service life. The exterior coating is corrosion‑resistant, protecting the tank from the humid environment often found under kitchen sinks. The design also incorporates a pressure‑rated vent that releases excess pressure safely, extending the lifespan of both the tank and the connected RO membrane.
![[Product front view showing all components]](https://www.smartspots.store/wp-content/uploads/2026/08/3acf193bc1564e58aae1877356598fc6.jpg)
Usage
Designed for everyday household use, the tankRo expansion tank integrates seamlessly with a wide range of countertop and under‑sink RO systems, making it an ideal solution for families, health‑conscious individuals, and anyone seeking consistent access to clean drinking water. Whether you are filling a glass, preparing coffee, or cooking with purified water, the tank maintains a pressurized supply that eliminates the need to wait for the RO membrane to produce water on demand.
The tank’s 4‑gallon capacity is sufficient to support multiple simultaneous draws, reducing the frequency of system cycling and extending the lifespan of the RO membrane. By providing a buffer of stored water, the tank also helps to mitigate the impact of fluctuating inlet water pressure, ensuring a stable output flow rate. This is especially beneficial in homes with older plumbing or variable municipal water pressure.
Installation is straightforward: mount the tank in a convenient location under the sink, connect the 1/4‑inch ball valve to the RO system’s storage line, and secure the tank with the supplied brackets. The tank operates efficiently in temperatures up to 100 °F, making it suitable for most kitchen environments. For optimal performance, it is recommended to position the tank vertically, allowing the internal air charge to sit above the water column, which maximizes pressure stability.
Maintenance is minimal. Periodic checks for leaks, verification of the pressure gauge, and occasional flushing of the tank with clean water will keep the system operating at peak efficiency. The ball valve’s quick‑connect design enables easy disconnection for cleaning or replacement, and the tank’s durable construction means it can endure years of regular use without degradation.
Why Choose Us
Choosing the tankRo RO132‑TNK means selecting a product backed by a reputable manufacturer, Express Water, known for its commitment to quality and customer satisfaction. Each tank undergoes rigorous testing for durability, pressure tolerance, and leak resistance before leaving the factory, ensuring that you receive a reliable component that will perform for years.
The NSF certification provides an additional layer of confidence, confirming that the tank’s materials and construction meet industry‑approved standards for potable water storage. This certification is especially important for consumers who are vigilant about water safety and want assurance that their storage solution does not introduce any unwanted substances.
Express Water also offers a one‑year warranty and responsive after‑sales support, giving you peace of mind that any questions or concerns will be addressed promptly. The company’s technical support team can assist with installation guidance, troubleshooting, and parts replacement, ensuring a smooth experience from purchase to long‑term use.
By investing in this expansion tank, you benefit from reduced water waste, improved system efficiency, and a consistent supply of great‑tasting water for your household. The tank’s design reduces the number of start‑stop cycles of the RO pump, which not only saves energy but also prolongs the life of the pump and membrane, delivering cost savings over the lifespan of the system.
Furthermore, the tank’s compact size means it does not compromise valuable cabinet space, a common concern for homeowners with limited kitchen storage. Its sleek white finish blends with most sink cabinets, providing an unobtrusive aesthetic that does not detract from the overall kitchen design.
Key Features
- Durable deep‑drawn steel construction ensures long‑term reliability and resistance to corrosion.
- NSF‑certified design guarantees safe, contaminant‑free water storage for drinking and cooking.
- Compact 15 × 12 × 12 inches size fits easily under most kitchen sinks without sacrificing capacity.
- 1/4‑inch quick‑connect ball valve simplifies installation and future maintenance.
- 1‑year warranty and dedicated customer support provide confidence and assistance after purchase.
FAQ
What is the maximum water temperature the tank can handle?
The tank is rated for temperatures up to 100 °F, making it suitable for typical kitchen environments without risk of material degradation.
Can I install the tank myself, or do I need a professional?
The tank includes a 1/4‑inch ball valve with quick‑connect fittings and mounting brackets, allowing most DIY‑savvy homeowners to install it with basic tools. However, if you are unfamiliar with plumbing connections, consulting a licensed plumber is recommended.
How often should I replace the expansion tank?
With proper installation and regular maintenance of your RO system, the tankRo expansion tank is designed to last many years. The one‑year warranty covers any manufacturing defects, and routine inspection for leaks or pressure loss is advisable.
Is the tank compatible with all reverse osmosis systems?
The tank is compatible with most under‑sink and countertop RO units that use a 1/4‑inch storage line. Always verify your system’s specifications to ensure a proper fit.
What does NSF certification mean for this product?
NSF certification indicates that the tank meets strict standards for material safety, construction quality, and performance in storing potable water, providing an extra level of assurance for health‑conscious consumers.
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