---
product_id: 66564551
title: "3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve"
brand: "tankro"
price: "₨50165"
currency: LKR
in_stock: true
reviews_count: 13
category: "Tank Ro"
url: https://www.desertcart.lk/products/66564551-3-gallon-ro-expansion-tank-compact-reverse-osmosis-water-storage
store_origin: LK
region: Sri Lanka
---

# 3 Gallon Capacity 1/4” Quick Connect Valve Durable Steel Construction 3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve

**Brand:** tankro
**Price:** ₨50165
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with pure, pressure-perfect water storage!

## Quick Answers

- **What is this?** 3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve by tankro
- **How much does it cost?** ₨50165 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/66564551-3-gallon-ro-expansion-tank-compact-reverse-osmosis-water-storage)

## Best For

- tankro enthusiasts

## Why This Product

- Trusted tankro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Deep-drawn steel domes with precision welding provide unmatched durability backed by a 1-year warranty.
- • **Compact Under-Sink Fit:** Designed to seamlessly slide under most kitchen sinks (14x9x9 inches) for space-saving convenience.
- • **Effortless Installation:** Includes a free tank ball valve with quick-connect design for hassle-free setup and replacement.
- • **On-Demand Filtered Water:** Stores up to 2.2 gallons of purified water, delivering instant access to clean hydration.
- • **Premium Food-Grade Materials:** 100% safe, chemical-free water storage ensuring pure, fresh drinking water every time.

## Overview

The tankRo 3 Gallon RO Expansion Tank is a compact, durable water storage solution designed for reverse osmosis systems. Made from 100% food-grade materials and rugged steel construction, it ensures safe, chemical-free water storage. Its space-saving design fits under most sinks, and the included quick-connect ball valve makes installation effortless. With a 3-gallon capacity and a 1-year warranty, it delivers reliable, on-demand filtered water for your home or office.

## Description

tankRo 3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve - desertcart.com

Review: Exactly What I Needed - Works Great - Easy to install, good quality and works like a charm. Much cheaper than getting a replacement through Kinetico.
Review: Good quality and fair price - Works exceptionally well as expected

## Features

- Reverse Osmosis Tank: Made from 100% food grade materials, this RO water tank stores and keeps your water free from any impurities and harsh chemicals. The perfect addition to any RO water system.
- Easy to Install Water Tank: RO tank replacements include free tank ball valve for easy set-up and replacement with 1⁄4” quick connect design.
- Durable Water Storage Tank: This RO water tank is rigorously tested for quality and durability and includes a 1-year warranty.
- High Quality Water Tank: This water storage tank is made from durable deep-drawn steel domes with precision welding to ensure long lasting value for your RO water system.
- Water Tank Dimensions: This compact water tank is designed (14 x 9 x 9) to fit under most kitchen sinks. Stores up to 2.2 gallons of water for on-demand filtered drinking water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B079YZ8THK |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #50,267 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #105 in Under-Sink & Countertop Filtration |
| Brand | tankRo |
| Color | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,360) |
| Date First Available | February 21, 2018 |
| Installation Type | Under Sink |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 5.89 pounds |
| Item model number | GTS3 |
| Manufacturer | tankRo |
| Model Name | GTS3 |
| Package Information | Tank |
| Part Number | GTS3 |
| Power Source | Adapter |
| Product Dimensions | 9"L x 9"W x 14"H |
| Size | 3 Gallons |
| Special Feature | Durable |
| Special Features | Durable |
| Supported Water TDS Level Maximum (PPM) | 2000 |
| UPC | 653590999287 |
| Upper Temperature Rating | 100 Degrees Fahrenheit |

## Product Details

- **Brand:** tankRo
- **Capacity:** 3 Gallons
- **Included Components:** Tank
- **Installation Type:** Under Sink
- **Material:** BPA Free
- **Package Information:** Tank
- **Power Source:** Adapter
- **Product Dimensions:** 9"L x 9"W x 14"H
- **Purification Method:** Reverse Osmosis
- **Special Feature:** Durable

## Images

![3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve - Image 1](https://m.media-amazon.com/images/I/61vCanYEe6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Exactly What I Needed - Works Great
*by J***I on November 26, 2025*

Easy to install, good quality and works like a charm. Much cheaper than getting a replacement through Kinetico.

### ⭐⭐⭐⭐⭐ Good quality and fair price
*by J***N on January 21, 2026*

Works exceptionally well as expected

### ⭐⭐⭐⭐⭐ Ditch that small tank for this - you will be glad you did. SO. MUCH. WATER!
*by B***Y on September 11, 2025*

Original RO system came with a paltry 3 gallon tank, of which only 1.8 gallons was for water storage. I didn't know how awful that was until the membrane in that tank died. Determined to ensure we always have enough RO and plenty of pressure in the line, I doubled the desired capacity, and then DOUBLED it AGAIN. So, the 8 desired gallons of liquid required a 10-12 gallon tank. The tank came with ZERO installation hardware. I stole the old valve from the old tank which worked out just fine. By morning, we had 8 gallons of RO water flowing. I strongly recommend this tank!

## Frequently Bought Together

- TankRO - RO Water Filtration System Expansion Tank - 3 Gallon Compact Reverse Osmosis Water Storage Pressure Tank With Free 1/4" Ball Valve
- Metpure Quick Connect Tank Ball Valve with Gasket For Water Purification Systems And Reverse Osmosis System Pressurized Water Storage Tank (1/4" Female NPT x 3/8" OD Quick Connect)
- John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP

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**Shop now:** [https://www.desertcart.lk/products/66564551-3-gallon-ro-expansion-tank-compact-reverse-osmosis-water-storage](https://www.desertcart.lk/products/66564551-3-gallon-ro-expansion-tank-compact-reverse-osmosis-water-storage)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-23*