---
product_id: 11011230
title: "Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank"
brand: "apec water"
price: "$299.59"
currency: USD
in_stock: true
category: "Apec Water"
url: https://www.desertcart.us/products/11011230-tank-4-4-gallon-pre-pressurized-water-storage-tank
store_origin: US
region: United States of America
---

# 3.2 gal usable capacity 1/4 inch male pipe thread Food grade bladder, certified safe Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank

**Brand:** apec water
**Price:** $299.59
**Availability:** ✅ In Stock

## Summary

> 💧 Stay hydrated, stay ahead — pure water storage redefined!

## Quick Answers

- **What is this?** Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank by apec water
- **How much does it cost?** $299.59 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/11011230-tank-4-4-gallon-pre-pressurized-water-storage-tank)

## 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

- • **Versatile Installation:** Discharges efficiently in both vertical and horizontal positions with included tank stand for flexible setups.
- • **Premium Food-Grade Safety:** Equipped with a certified food-grade bladder ensuring pure, odor-free water every time.
- • **Certified Quality & Safety:** Individually pressure-tested and CE approved for global safety and durability standards.
- • **Durable Stainless Steel Build:** Robust stainless steel connectors and construction guarantee leak-free, long-lasting performance.
- • **Optimized Water Storage Capacity:** Holds up to 3.2 gallons of purified water for your daily hydration needs without interruption.

## Overview

The APEC Water Tank-4 is a 4-gallon pre-pressurized water storage tank designed for residential reverse osmosis systems. It holds up to 3.2 gallons of purified water, features a food-grade bladder certified for safety and durability, and supports efficient discharge in multiple orientations. Constructed with stainless steel connectors and fully enclosed reservoirs, it ensures leak-free, odorless water storage. Pressure-tested and CE approved, this tank is ideal for professional households seeking reliable, high-quality water storage solutions.

## 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)

## 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 | #7,433 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Undersink Water Filtration Replacement Parts |
| Brand Name | APEC WATER |
| Capacity | 4 gallons |
| Container Type | Tank |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,306) |
| Global Trade Identification Number | 00854961005310 |
| Included Components | TANK-4 |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 11"L x 11"W x 14.5"H |
| Item Type Name | Reverse Osmosis Tank |
| Item Weight | 0.9 kg |
| LowerTemperature Range | 33 °F |
| Manufacturer | APEC Water Systems |
| Material Type | Stainless Steel |
| Maximum Flow Rate | 0.8 gpm |
| Model Name | TANK-4 |
| Model Number | TANK-4 |
| Number of Items | 1 |
| Operating Pressure Range | 5-100 psi |
| Other Special Features of the Product | Heavy Duty |
| Part Number | TANK-4 |
| Power Source | Corded Electric |
| Purification Method | Reverse Osmosis |
| Supported Water TDS Level Maximum (PPM) | 500 |
| UPC | 854961005310 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** APEC WATER
- **Capacity:** 4 gallons
- **Included Components:** TANK-4
- **Installation Type:** Under Sink
- **Material:** Stainless Steel
- **Package Information:** Tank
- **Power Source:** Corded Electric
- **Product Dimensions:** 11"L x 11"W x 14.5"H
- **Purification Method:** Reverse Osmosis
- **Special Feature:** Heavy Duty

## Images

![Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank - Image 1](https://m.media-amazon.com/images/I/61qErEepoSL.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.

## 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 United States of America*
*Store origin: US*
*Last updated: 2026-08-15*