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💧 Elevate your hydration game with pure, on-demand RO water—because your health deserves the best!
The GTS3 3 Gallon RO Water Filtration Expansion Tank is a compact, durable, and easy-to-install storage solution made from BPA-free steel. Designed to fit under most kitchen sinks, it holds up to 2.2 gallons of reverse osmosis purified water, featuring a 1/4” quick connect ball valve for seamless integration with existing RO systems. Tested for quality and backed by a 1-year warranty, this tank ensures reliable, contaminant-free water storage for your home or office.










| ASIN | B079YZ8THK |
| Best Sellers Rank | #105,260 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #182 in Under-Sink & Countertop Filtration |
| Brand | tankRo |
| Brand Name | tankRo |
| Capacity | 3 gallons |
| Container Type | Tank |
| Customer Reviews | 4.5 out of 5 stars 1,409 Reviews |
| Included Components | Tank |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 9"L x 9"W x 14"H |
| Item Highlight | White Finish, Includes 1/4" Ball Valve, Durable Steel Construction, Universal Fit for RO Units |
| Item Weight | 6 pounds |
| LowerTemperature Range | 33 °F |
| Manufacturer | tankRo |
| Material | BPA Free |
| Material Type | BPA Free |
| Maximum Flow Rate | 0.8 gpm |
| Model Name | GTS3 |
| Model Number | GTS3 |
| Number of Items | 1 |
| Operating Pressure Range | 5-100 psi |
| Other Special Features of the Product | Durable |
| Part Number | GTS3 |
| Power Source | Adapter |
| Product Dimensions | 9"L x 9"W x 14"H |
| Purification Method | Reverse Osmosis |
| Special Feature | Durable |
| Supported Water TDS Level Maximum (PPM) | 2000 |
| UPC | 653590999287 |
| Upper Temperature Rating | 100 °F |
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