---
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: "S$275"
currency: SGD
in_stock: true
category: "Express Water"
url: https://www.desertcart.sg/products/256980379-express-water-ro-expansion-tank-4-gallon-nsf-certified-compact
store_origin: SG
region: Singapore
---

# 4-gallon capacity for ample filtered water 1/4" quick connect ball valve for easy installation 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:** S$275
**Availability:** ✅ In Stock

## Summary

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

## 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?** S$275 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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

- • **Built to Last:** Heavy-duty deep-drawn steel domes and precision welding deliver unmatched durability and corrosion resistance.
- • **Effortless Setup:** Includes a free tank ball valve with 1/4" quick connect design for hassle-free installation and replacement.
- • **Compact Powerhouse:** Fits seamlessly under most kitchen sinks (15x12x12 inches) without sacrificing storage capacity.
- • **Pure & Safe Hydration:** Made from 100% food-grade materials with a post-cured diaphragm to ensure tasteless, odorless, and contaminant-free water.
- • **Certified Peace of Mind:** NSF certified and rigorously tested with a 1-year warranty, guaranteeing quality and reliability for your RO system.

## Overview

The Express Water RO Expansion Tank is a compact, 4-gallon NSF certified storage tank designed for reverse osmosis systems. Crafted from food-grade materials and durable steel, it ensures safe, contaminant-free water with a post-cured diaphragm and pre-pressurized air bladder for consistent flow. Easy to install with a free ball valve and built to fit under most kitchen sinks, this tank offers reliable, long-lasting performance backed by a 1-year warranty.

## Description

The tankRO 4 Gallon Water Storage Tank gives tasteless, odorless, and impurity free water. Get a quality tank you can rely on today for your RO system. The post cured diaphragm means sterile water distribution to keep your water safe. The water reservoir tank 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. Designed to fit under sinks this water tank will fit most kitchen cabinets, it is made to work when lying on its side or upright. The expansion 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 water filter tank is also designed to survive the outdoor elements with a two-part epoxy primer and polyurethane paint finish. This is a fully functional water pressure tank for water wells. The water accumulator chamber of the RO water tank includes the highest grade of polypropylene, virgin polypropylene, meaning you have the most durable and smooth inside lining. This water storage 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 | #145,654 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #318 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 (2,152) |
| 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 | 3.47 Kilograms |
| 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 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Other Special Features of the Product | NSF certified |
| Part Number | V-RO132-TNK |
| Power Source | Water Pressure |
| Purification Method | Reverse Osmosis |
| Supported Water TDS Level Maximum (PPM) | 1000 |
| UPC | 641990965834 |
| Unit Count | 1 Count |
| 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

## 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
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- DIGITEN 1/4" Automatic Shut-Off Valve with Quick-Connect Fittings For RO Reverse Osmosis(Pack of 2)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-19*