---
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: "1868.14 DT"
currency: TND
in_stock: true
reviews_count: 6
url: https://www.desertcart.tn/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact
store_origin: TN
region: Tunisia
---

# 4 Gallon capacity for ample filtered water 1/4" quick connect ball valve for easy install NSF Certified & 1-year warranty for trusted safety Express Water Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve

**Brand:** express water
**Price:** 1868.14 DT
**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?** 1868.14 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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:** Sleek 15x12x12 inch design slides effortlessly into most kitchen cabinets, saving valuable space.
- • **Certified Peace of Mind:** NSF certification plus rigorous quality testing and a 1-year warranty means you’re investing in reliability and health.
- • **Durability Meets Design:** Heavy-duty deep-drawn steel domes with precision welding and epoxy/polyurethane finish ensure long-lasting, corrosion-resistant performance.
- • **Effortless Installation:** Includes free ball valve with quick-connect design—get your RO system up and running in minutes, no plumber needed.
- • **Premium Food-Grade Materials:** Crafted from 100% food-safe polypropylene and alloy steel for pure, contaminant-free water every time.

## Overview

The Express Water RO Expansion Tank offers a 4-gallon capacity with a compact footprint designed to fit under most kitchen sinks. Made from 100% food-grade materials and heavy-duty steel, it ensures contaminant-free water storage with NSF certification and a 1-year warranty. Featuring a free quick-connect ball valve for easy installation and a durable epoxy-coated finish, this tank delivers reliable, pressurized reverse osmosis water on demand.

## 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.

## 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 | #113,569 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #258 in Under-Sink Water Filters |
| Brand Name | Express Water |
| Capacity | 4 Gallons |
| Container Type | Dispenser |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,120) 4.6 out of 5 stars |
| Global Trade Identification Number | 00641990965834 |
| Included Components | Tank Ball Valve, Tank Stand |
| Installation Type | Under Sink |
| Item Dimensions L X W X H | 38.1L x 30.5W x 30.5H centimeters |
| Item Weight | 7.3 Pounds |
| Lowertemperature Range | 33 Degrees Fahrenheit |
| Manufacture Year | 2022 |
| Manufacturer | Express Water Inc |
| Material Type | Alloy Steel, Polypropylene, Polyurethane |
| Maximum Flow Rate | 0.8 Gallons Per Minute |
| Model Name | RO132-TNK |
| Model Number | RO132-TNK |
| Other Special Features Of The Product | NSF certified |
| Part Number | V-RO132-TNK |
| Power Source | Water Pressure |
| Purification Method | Reverse Osmosis |
| Smart Home Compatibility | Not Smart Home Compatible |
| Supported Water Tds Level Maximum Ppm | 1000 |
| Unit Count | 1 Count |
| Upc | 641990965834 |
| Upper Temperature Rating | 100 Degrees Fahrenheit |

## 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/61HS3xWEkIL.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  on Reviewed in the United Arab Emirates 23 July 2021*

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

### ⭐⭐⭐⭐⭐ Works perfectly
*by  on Reviewed in the United States 10 February 2026*

Great item. Company easy to work with

### ⭐⭐⭐⭐⭐ Simple and works for good price
*by  on Reviewed in the United States 3 November 2025*

Simple hookup. Works great! Eliminated pulsing (on/off) of a tankless/pumped RO water filter system connected to fridge and coffee maker. Now I have good pressure at every fixture served by RO water filter 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.tn/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact](https://www.desertcart.tn/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-17*