---
product_id: 256163481
title: "APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread"
brand: "apec water"
price: "$357.00"
currency: USD
in_stock: true
reviews_count: 6
category: "Apec Water"
url: https://www.desertcart.us/products/256163481-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized
store_origin: US
region: United States of America
---

# 4-gallon capacity Pre-pressurized for instant flow Food-grade bladder, certified safe APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread

**Brand:** apec water
**Price:** $357.00
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of the curve with pure, pressurized perfection!

## Quick Answers

- **What is this?** APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread by apec water
- **How much does it cost?** $357.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/256163481-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized)

## Best For

- apec water enthusiasts

## Why This Product

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

## Key Features

- • **Safe & Pure Every Drop:** Food-grade bladder with CE certification guarantees contaminant-free, fresh-tasting water.
- • **Built to Last, Built for You:** Durable stainless steel connectors and airtight polypropylene shell prevent leaks and odors, ensuring long-term reliability.
- • **Maximize Your Hydration Game:** 4-gallon capacity ensures your RO system never runs dry during busy days.
- • **Pressure-Perfect Performance:** Pre-pressurized tank delivers fast, consistent water flow—no waiting, no hassle.
- • **Flexible Installation, Zero Compromise:** Works efficiently in vertical or horizontal positions with included tank stand for seamless setup.

## Overview

The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis storage tank designed for residential use. Featuring a food-grade bladder and certified materials, it ensures safe, odor-free water storage. Its versatile design supports both vertical and horizontal installation, while stainless steel connectors and airtight construction guarantee durability and leak protection. Ideal for millennial professionals seeking reliable, high-quality hydration solutions that seamlessly integrate into modern homes.

## Description

Our standard ro water tanks offer quality water storage for use with most residential reverse osmosis systems. These durable metal tanks will deliver a continuous and stable Supply of purified water at a fast flow rate with high volume suitable for average to large size families. Supported by fully enclosed polypropylene and butyl reservoirs, these storage tanks provide airtight protection against leaks. Their stainless steel connectors ensure leach-free integrity while post-cured diaphragms eliminate the possibility of odors from the tank. Individually pressure-tested for safety, all our tanks are certified and ce approved for materials quality, safety, and durability making them suitable for use anywhere in the world. Specifications: dimensions: 11 inch D x 15 inch h weight: 10 lbs. Optional tank ball valve: 1/4 inch connection to 1/4 inch or 3/8 inch tube size (not included with the tank) apec water does not distribute or sell our products to any 3RD party sellers on desertcart. Please purchase genuine apec water products from desertcart or apec water directly for authenticity.

Review: 10 - ممتاز 💯💯💯💯💯
Review: So far, so good! - I bought this to replace the stock tank for my RO system from GE. The old tank was barely putting out two cups of water at a time. However, the stock replacement was going to be around $150, so I was looking for a cheaper option. Since this tank is carried by the same store that I bought the RO system from, and they have it labeled as an "industry standard" in terms of pressure settings, I decided to give it a try. And so far, it works great! Much better pressure, and I get a lot more water out of the system at a time. Notably too, the water tastes better! Maybe because it's not mixing with old, stagnant water that can't be expelled. Super easy to install! Bought a shut off valve fitting to connect the tank to the plastic line of my system, and managed to connect it easily. Be sure to use plumbers tape on the fitting. I also used an O-ring for good measure. So far, no issues with leaking, as other people are reporting in their reviews.

## Features

- Pre-pressurized 4 gallon water storage tank (holds up to 3.2 gallon of water)
- Discharge efficiently in a vertical or horizontal position with tank stand
- Food grade bladder and certified to ensure quality, safety and durability
- Inlet/outlet connection: 1/4 inch male pipe thread. Special designed for ro application

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00LU28SHE |
| Best Sellers Rank | #59,347 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #148 in Under-Sink Water Filters |
| Brand | APEC WATER |
| Brand Name | APEC WATER |
| Capacity | 4 gallons |
| Container Type | Dispenser |
| Customer Reviews | 4.6 out of 5 stars 2,412 Reviews |
| Global Trade Identification Number | 00854961005310 |
| Included Components | Memory, tank stand |
| Included components | Memory, tank stand |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 27.9L x 27.9W x 36.8H centimeters |
| Item Type Name | Reverse Osmosis Tank |
| Item Weight | 0.9 Kilograms |
| Manufacturer | APEC Water Systems |
| Material | Stainless Steel |
| Material Type | Stainless Steel |
| Model Name | TANK-4 |
| Model Number | TANK-4 |
| Other Special Features of the Product | Heavy Duty |
| Part Number | TANK-4 |
| Power Source | Manual (No Power Source Required) |
| Product dimensions | 27.9L x 27.9W x 36.8H centimeters |
| Purification Method | Reverse Osmosis |
| Special features | Heavy Duty |
| Supported Water TDS Level Maximum (PPM) | 500 |
| UPC | 854961005310 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** APEC WATER
- **Capacity:** 4 Gallons
- **Material:** Stainless Steel
- **Product dimensions:** 27.9L x 27.9W x 36.8H centimeters
- **Special features:** Heavy Duty

## Images

![APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread - Image 1](https://m.media-amazon.com/images/I/61qErEepoSL.jpg)
![APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread - Image 2](https://m.media-amazon.com/images/I/717Hczyv8gL.jpg)
![APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread - Image 3](https://m.media-amazon.com/images/I/71aOw3xUCNL.jpg)
![APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread - Image 4](https://m.media-amazon.com/images/I/713rLh1lugL.jpg)
![APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank | Holds up to 10 liters, food grade bladder, efficient discharge options, 1/4 inch male pipe thread - Image 5](https://m.media-amazon.com/images/I/71poldwHLRL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: What is the recommended pressure for this expansion tank?**
A: They come pressurized from the manufacturer with a required 4-6 psi.

**Q: What is the size of the male threaded fitting on the top?  3/8"?**
A: Size? Mine is in storage so not sure . The thread is tapered for a tight fit. Check APEC web site. It likely is the 3/8". Appears to be less than 1/2" and for sure more than 1/4"

**Q: What is the recommended pressure for this expansion tank?**
A: Label on my tank says 100 psi max.
At one point, my tank was not putting out much water. I hooked up a pump which said there was about 20psi in the tank. I charged it to 95 and it works like it did when it was new.

**Q: I need replacement tank for my Ecowater ero335. Is this a comparable model. The company here says everything out there is plastic.**
A: I do t know if this will fit your exact model. But it should. just make sure the intake/outtake valve is the same size as your current tank. This one is definitely not plastic and the water has tasted great.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 10
*by U***E on 2 July 2025*

ممتاز 💯💯💯💯💯

### ⭐⭐⭐⭐⭐ So far, so good!
*by C***R on 3 December 2024*

I bought this to replace the stock tank for my RO system from GE. The old tank was barely putting out two cups of water at a time. However, the stock replacement was going to be around $150, so I was looking for a cheaper option. Since this tank is carried by the same store that I bought the RO system from, and they have it labeled as an "industry standard" in terms of pressure settings, I decided to give it a try. And so far, it works great! Much better pressure, and I get a lot more water out of the system at a time. Notably too, the water tastes better! Maybe because it's not mixing with old, stagnant water that can't be expelled. Super easy to install! Bought a shut off valve fitting to connect the tank to the plastic line of my system, and managed to connect it easily. Be sure to use plumbers tape on the fitting. I also used an O-ring for good measure. So far, no issues with leaking, as other people are reporting in their reviews.

### ⭐⭐⭐⭐⭐ EXCELENTE PRODUCTO, MUY PRACTICO Y UTIL
*by J***O on 4 July 2024*

BUENA CAPACIDAD

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-30*