---
product_id: 256980379
title: "Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve"
brand: "express water"
price: "₩239552"
currency: KRW
in_stock: true
reviews_count: 6
category: "Express Water"
url: https://www.desertcart.kr/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact
store_origin: KR
region: South Korea
---

# 3.2 gal water capacity 1/4" quick connect valve NSF certified & 1-year warranty Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve

**Brand:** express water
**Price:** ₩239552
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with pure, pressurized perfection!

## Quick Answers

- **What is this?** Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve by express water
- **How much does it cost?** ₩239552 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact)

## Best For

- express water enthusiasts

## Why This Product

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

## Key Features

- • **Compact Under-Sink Fit:** Designed to seamlessly tuck under most kitchen sinks (15x12x12 inches) for sleek, space-saving installation.
- • **Pure & Safe Water Storage:** Crafted from 100% food-grade materials with a post-cured diaphragm to ensure tasteless, odorless, contaminant-free water every time.
- • **Versatile & Weather-Resistant:** Two-part epoxy primer and polyurethane paint finish protect against outdoor elements, making it ideal for both indoor and outdoor use.
- • **Effortless Setup & Maintenance:** Includes a free tank ball valve with 1/4" quick connect design for fast, tool-free installation and hassle-free replacements.
- • **Built to Last with Commercial Strength:** Durable deep-drawn steel domes and precision welded seams withstand up to 100 PSI, backed by rigorous quality testing and a 1-year warranty.

## Overview

The Express Water Ro Expansion Tank is a compact, NSF-certified 4-gallon reverse osmosis storage tank designed for under-sink installation. Made from 100% food-grade materials and durable steel with precision welding, it ensures contaminant-free water storage with a 3.2-gallon capacity. Featuring a free 1/4" quick connect ball valve and a robust build rated for 100 PSI, this tank offers easy installation, long-lasting durability, and reliable performance backed by a 1-year warranty.

## Description

The tankRO 4 Gallon Water Storage Tank gives tasteless, odorless, and contaminant free water. Get a quality tank you can rely on today. The post cured diaphragm means sterile water distribution to keep your water safe. The water reservoir can hold up to 3.2 gallons of water at once, with the rest of the storage area being occupied by the pre pressurized air bladder, which helps you draw water from the tank. This tank comes with a free Tank Ball Valve and a free Tank Stand. All components are NSF Certified. Designed to fit under sinks this water holding tank will fit most kitchen cabinets, it is made to work when lying on its side or upright. The Tank is durability tested at several stages and is backed with a one year warranty. Maximum working pressure of the tank is 100 PSI. The tank is also designed to survive the outdoor elements with a two part epoxy primer and polyurethane paint finish. This is a fully functional pressure tank for water wells. The water accumulator chamber of the tank includes the highest grade of polypropylene, virgin polypropylene, meaning you have the most durable and smooth inside lining. This tank is built to last with heavy duty commercial construction with durable deep drawn steel domes and precision welded seams. Improve your water today.

Review: Not as show in photos - I received different brand not same as show in photos. Without back stand and Different Fittings.
Review: Great item. Company easy to work with

## Features

- Reverse Osmosis Tank: Made from 100% food grade materials, this RO water tank stores and keeps your water free from any contaminants 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.
- Certified Water Storage Tank: This RO water tank is NSF Certified and includes a 1-year warranty. Every water tank is rigorously tested for quality and durability.
- 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 (15 x 12 x 12) to fit under most kitchen sinks. Stores up to 3.2 gallons of water for on-demand filtered drinking water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00Q798N8E |
| Best Sellers Rank | #176,757 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #375 in Under-Sink Water Filters |
| Item model number | RO132-TNK |
| Manufacturer | Express Water Inc |
| Product Dimensions | 38.1 x 30.48 x 30.48 cm; 3.47 kg |

## Product Details

- **Brand:** Express Water
- **Capacity:** 4 Gallons
- **Material:** Alloy Steel, Polypropylene, Polyurethane
- **Product dimensions:** 38.1L x 30.5W x 30.5H centimeters
- **Special features:** NSF certified

## Images

![Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve - Image 1](https://m.media-amazon.com/images/I/617s2+SsU8L.jpg)
![Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve - Image 2](https://m.media-amazon.com/images/I/61L-uKfsISL.jpg)
![Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve - Image 3](https://m.media-amazon.com/images/I/71FOY0jNraL.jpg)
![Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve - Image 4](https://m.media-amazon.com/images/I/71uApG7fcBS.jpg)
![Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve - Image 5](https://m.media-amazon.com/images/I/61g18sKDhwL.jpg)

## Questions & Answers

**Q: what country made in?**
A: They’re made in Taiwan per the printing on the box which the tank arrived within.

**Q: 4 gallon okay in place of 3.2 gallon tank**
A: Yes I bought the 4.o gallon unit and it works fine.  I checked the pressure in the tank and had to pump it up to 8.0 psi for my system.

**Q: Will this work with a watts WP-4V and similar systems?**
A: It is a universal unit and will work with all RO systems. It may require an adopter based on tube size. Thx

**Q: has anyone checked their stored water for leeching chemicals?**
A: i have had my water checked for LEAD recently, no issues

## Customer Reviews

### ⭐⭐ Not as show in photos
*by A***A on 23 July 2021*

I received different brand not same as show in photos. Without back stand and Different Fittings.

### ⭐⭐⭐⭐⭐ Review
*by D***N on 10 February 2026*

Great item. Company easy to work with

### ⭐⭐⭐⭐⭐ Review
*by N***9 on 12 January 2026*

Works great, even better than the original glacier bay that came with my RO system.

## Frequently Bought Together

- tankRo RO132-TNK RO Water Filtration System Expansion Tank 4 Gallon Capacity – NSF Certified – Compact Reverse Osmosis Water Storage Pressure Tank 1/4" Tank Ball Valve
- Malida 1/4 inch O.D. Length 32.8ft(10 meters) RO Water Tubing, Hose Pipe for RO Water purifiers System,+ 1/4 O.D quick connector 10pcs
- DIGITEN 1/4" Automatic Shut-Off Valve with Quick-Connect Fittings For RO Reverse Osmosis(Pack of 2)

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**Shop now:** [https://www.desertcart.kr/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact](https://www.desertcart.kr/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-02-24*