---
product_id: 11011230
title: "Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank"
brand: "apec water"
price: "₱7560"
currency: PHP
in_stock: true
reviews_count: 8
category: "Apec Water"
url: https://www.desertcart.ph/products/11011230-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis
store_origin: PH
region: Philippines
---

# 4 gal pre-pressurized capacity vertical/horizontal discharge food-grade, certified bladder Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank

**Brand:** apec water
**Price:** ₱7560
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of thirst with premium purity and pressure!

## Quick Answers

- **What is this?** Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank by apec water
- **How much does it cost?** ₱7560 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/11011230-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis)

## 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, Always:** Food-grade bladder and CE-certified materials ensure your water stays fresh, odor-free, and contaminant-free.
- • **Plug & Play Simplicity:** 1/4 inch male pipe thread inlet/outlet designed specifically for RO systems, making installation effortless.
- • **Built to Last, Built for You:** Durable stainless steel construction with leak-proof polypropylene and butyl reservoirs for long-term reliability.
- • **Consistent Hydration, Zero Wait:** Pre-pressurized 4-gallon tank delivers up to 3.2 gallons of purified water instantly, perfect for busy households.
- • **Flexible Installation, No Compromise:** Engineered for both vertical and horizontal placement with a sturdy tank stand, fitting seamlessly into any space.

## Overview

The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis storage tank designed for residential use. It holds up to 3.2 gallons of purified water and supports both vertical and horizontal installation. Constructed with food-grade, CE-certified materials and stainless steel connectors, it guarantees safe, odor-free water storage. Its compact 11"x11"x14.5" size and heavy-duty build make it ideal for average to large families seeking reliable, high-volume RO water supply.

## Description

Our standard ro water tanks offer quality water storage for use with most residential Reverse osmosis systems. Built with stainless steel construction, these durable 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)

Review: Its Great!!!! - Works great! I got the water pressure back. Easy to install.
Review: Great little RO tank - Works great, easy to install, I replaced a 10 year old tank that started leaking at the Schrader valve, this tank did the trick. Amazing volume of water before it starts to slow.

## 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 |
|---------------|-------|
| Brand | APEC WATER |
| Capacity | 4 Gallons |
| Included Components | TANK-4 |
| Material | Stainless Steel |
| Product Dimensions | 11"L x 11"W x 14.5"H |
| Special Feature | Heavy Duty |

## Product Details

- **Brand:** APEC WATER
- **Capacity:** 4 Gallons
- **Included Components:** TANK-4
- **Installation Type:** Under Sink
- **Item Weight:** 0.9 Kilograms
- **Material:** Stainless Steel
- **Package Information:** Tank
- **Product Dimensions:** 11"L x 11"W x 14.5"H
- **Purification Method:** Reverse Osmosis
- **Special Feature:** Heavy Duty

## Images

![Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank - Image 1](https://m.media-amazon.com/images/I/71yb+3-D5lL.jpg)

## Available Options

This product comes in different **Size** 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

### ⭐⭐⭐⭐⭐ Its Great!!!!
*by A***N on December 4, 2025*

Works great! I got the water pressure back. Easy to install.

### ⭐⭐⭐⭐⭐ Great little RO tank
*by A***R on November 26, 2025*

Works great, easy to install, I replaced a 10 year old tank that started leaking at the Schrader valve, this tank did the trick. Amazing volume of water before it starts to slow.

### ⭐⭐⭐⭐⭐ Very pleased with this purchase
*by C***T on November 12, 2025*

Working well, capacity seems to be as advertised. No funny orders or taste. Easy to install. Preset pressure was perfect. Replaced the old 4 gallon that couldn’t keep up with family needs.

## Frequently Bought Together

- APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank
- 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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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-01-24*