---
product_id: 15953032
title: "Hydronix PAE (RO-122) Water Storage Tank - 1/4\" MPT for Reverse Osmosis (RO) Systems - 2.2 Gallon Volume Capacity (White)"
brand: "pa-e"
price: "AR$326873"
currency: ARS
in_stock: true
reviews_count: 8
category: "Pa E"
url: https://www.desertcart.com.ar/products/15953032-hydronix-pae-ro-122-water-storage-tank-1-4-mpt
store_origin: AR
region: Argentina
---

# 2.2 gal capacity 1/4" MPT stainless steel connection NSF/ANSI 58 certified safety Hydronix PAE (RO-122) Water Storage Tank - 1/4" MPT for Reverse Osmosis (RO) Systems - 2.2 Gallon Volume Capacity (White)

**Brand:** pa-e
**Price:** AR$326873
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with pressurized purity on demand!

## Quick Answers

- **What is this?** Hydronix PAE (RO-122) Water Storage Tank - 1/4" MPT for Reverse Osmosis (RO) Systems - 2.2 Gallon Volume Capacity (White) by pa-e
- **How much does it cost?** AR$326873 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/15953032-hydronix-pae-ro-122-water-storage-tank-1-4-mpt)

## Best For

- pa-e enthusiasts

## Why This Product

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

## Key Features

- • **Compact Powerhouse:** 2.2-gallon volume delivers steady, pressurized RO water on demand without hogging your under-sink space.
- • **Versatile Fit & Flow:** Works vertically or horizontally, ideal for compact kitchens, RVs, or campers—because your lifestyle deserves flexible hydration.
- • **Effortless Installation:** Pre-charged, maintenance-free bladder design means plug-and-play setup—perfect for busy professionals who value efficiency.
- • **Built to Last & Leak-Free:** Stainless steel 1/4" MPT connection with sealed brass air valve and o-ring cap ensures zero leaks and long-term durability.
- • **Certified Clean Confidence:** NSF/ANSI Standard 58 certified with post-cured diaphragm guarantees tasteless, odorless, contaminant-free water every time.

## Overview

The Hydronix PAE RO-122 is a 2.2-gallon reverse osmosis water storage tank featuring a durable stainless steel 1/4" MPT connection and a maintenance-free, pre-charged internal bladder. NSF/ANSI 58 certified, it ensures safe, clean, and contaminant-free water. Compact and versatile, it fits under sinks, in RVs, or campers, delivering consistent pressurized filtered water with easy installation and leak-proof reliability.

## Description

The RO-122 tank's water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel 1/4" MPT water connection. The diaphragm is post-cured to ensure that your water is tasteless, odorless and contaminant free. The tank is built with a sealed brass air valve and o-ring sealed cap to ensure a leak-free air chamber. Perfect for compact under sink RO units, RVs, Campers, or any other use where space is limited. This tank discharges efficiently in a vertical or horizontal position. Tank comes with Pre-charged pressure and ready to use. A Fitting is required to connect to your water system and faucet

Review: Easy install, works very well - This was a replacement tank for an existing installation. The previous tank was a 5-gallon and took up an excessive amount of room under the sink. I have never done this type of installation before, but it was easy enough: 1) turn water to RO system off; 2) turn old tank off (there should be a valve on the old tank for this; if not, get a bucket and lots of towels ready); 3) disconnect (see below) the hose going to old tank (you can do this at either end, but there will be some leakage; also if you do not have a open/close valve on the old tank, disconnect the hose at the non-tank end and stick it into your bucket as quickly as you can); 4) remove old tank, take outside, re-open valve, admire the fountain; 5) unless you bought a new one, unscrew valve from old tank; 6) put a couple of turns of Teflon tape around the new tank stem; 7) screw valve onto new tank, leaving valve in open position; 8) put new tank into place; 9) reconnect pipe; 10) turn water back on and check for leaks. Leave it overnight to come up to pressure (water stream will be feeble until this happens). A note on dis- and re-connecting hoses: my installation used push-on connectors and I found that pushing in the little ring surrounding the hose and then pulling on the hose was the easiest way to get them disconnected. I really needed a third hand or a pair of small pliers. Also, when re-connecting the hose, make sure they are pushed in the whole way!
Review: Perfect replacememt for Whirlpool WHER25 - Bladder in our original tank failed. Contacted Whirlpool and they "suggested" that although we could purchase a replacement tank through them, it would be more cost efficient if we purchased a completely new system. It would come with filters that we wouldn't need right now, but could keep for later. I was hesitant to shell out another $300 for a complete unit when all we needed was a new tank and figured for the price, I'd give this one a try. The only snag, was that the valve fitting on top did not fit directly to the line connection of the Whirlpool system. No problem - - - remove the adapter fitting, and connect. Fits, works and what a cost savings.

## Features

- [TORAGE TANK FOR HOME SYSTEMS: The PAE RO-122 stainless steel reverse osmosis storage tank is compatible with most under-sink RO water filter systems
- With a 2.2-gallon total volume capacity, it provides a consistent supply of pressurized filtered water on demand
- MAINTENANCE-FREE PRESSURE TANK: This RO water storage tank is NSF/ANSI Standard 58 certified, meeting strict health and safety standards for drinking water systems
- It is pre-pressurized, INTERNAL BLADDER DESIGN: The PAE RO-122 bladder-style reverse osmosis tank uses a pre-charged internal diaphragm to deliver steady, pressurized water flow., SAFE MATERIALS FOR CLEAN DRINKING WATER
- The diaphragm inside this reverse osmosis water pressure tank is post-cured to remove harmful chemicals and residues, ensuring cleaner, safer water.]

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00A7GFVI8 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #378,375 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #669 in Under-Sink & Countertop Filtration |
| Brand | PA-E |
| Certification | certified frustration-free |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (303) |
| Date First Available | October 14, 2011 |
| Installation Type | Under Sink |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 5.96 pounds |
| Item model number | RO-122 |
| Manufacturer | PAE |
| Model Name | RO 122 |
| Package Information | Can |
| Part Number | RO-122 |
| Product Dimensions | 9"L x 9"W x 14"H |
| Purification Method | Reverse Osmosis |
| Size | 14.5X9.5X9.5 INCHES |
| Special Feature | NSF certified |
| Special Features | NSF certified |
| Supported Water TDS Level Maximum (PPM) | 500 |
| UPC | 670541140116 661799343824 |

## Product Details

- **Brand:** PA-E
- **Capacity:** 2.2 Gallons
- **Installation Type:** Under Sink
- **Material:** Metal
- **Model Name:** RO 122
- **Package Information:** Can
- **Product Dimensions:** 9"L x 9"W x 14"H
- **Purification Method:** Reverse Osmosis
- **Special Feature:** NSF certified
- **Supported Water TDS Level Maximum (PPM):** 500

## Images

![Hydronix PAE (RO-122) Water Storage Tank - 1/4" MPT for Reverse Osmosis (RO) Systems - 2.2 Gallon Volume Capacity (White) - Image 1](https://m.media-amazon.com/images/I/71sgAMPuAFL.jpg)

## Questions & Answers

**Q: how much time it's good until need replacement ?**
A: Mine lasted 18 months.  Considering it was a replacement for a different tank that lasted 5 years, I consider that pretty poor.

**Q: How much pressure is in it when received?**
A: It comes with the proper pressure.  Over time, the pressure will get too low.  Go on YouTube to
For instructions on how to re-pressurize.

**Q: Pba free?**
A: works well

**Q: What's the recommended pressure to keep on the bladder?  8psi?**
A: Pre-charge with 5-7 psi of air pressure. When tank is full it may reach 45 to 50 psi of pressure depending on your RO system.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy install, works very well
*by S***R on December 23, 2019*

This was a replacement tank for an existing installation. The previous tank was a 5-gallon and took up an excessive amount of room under the sink. I have never done this type of installation before, but it was easy enough: 1) turn water to RO system off; 2) turn old tank off (there should be a valve on the old tank for this; if not, get a bucket and lots of towels ready); 3) disconnect (see below) the hose going to old tank (you can do this at either end, but there will be some leakage; also if you do not have a open/close valve on the old tank, disconnect the hose at the non-tank end and stick it into your bucket as quickly as you can); 4) remove old tank, take outside, re-open valve, admire the fountain; 5) unless you bought a new one, unscrew valve from old tank; 6) put a couple of turns of Teflon tape around the new tank stem; 7) screw valve onto new tank, leaving valve in open position; 8) put new tank into place; 9) reconnect pipe; 10) turn water back on and check for leaks. Leave it overnight to come up to pressure (water stream will be feeble until this happens). A note on dis- and re-connecting hoses: my installation used push-on connectors and I found that pushing in the little ring surrounding the hose and then pulling on the hose was the easiest way to get them disconnected. I really needed a third hand or a pair of small pliers. Also, when re-connecting the hose, make sure they are pushed in the whole way!

### ⭐⭐⭐⭐⭐ Perfect replacememt for Whirlpool WHER25
*by B***B on September 21, 2013*

Bladder in our original tank failed. Contacted Whirlpool and they "suggested" that although we could purchase a replacement tank through them, it would be more cost efficient if we purchased a completely new system. It would come with filters that we wouldn't need right now, but could keep for later. I was hesitant to shell out another $300 for a complete unit when all we needed was a new tank and figured for the price, I'd give this one a try. The only snag, was that the valve fitting on top did not fit directly to the line connection of the Whirlpool system. No problem - - - remove the adapter fitting, and connect. Fits, works and what a cost savings.

### ⭐⭐⭐⭐ Not As Pictured
*by C***. on March 18, 2023*

This product worked fine and is similar to the item pictured in the ad although the manufacturer is not PAE Machinery Industrial CO. The product also shipped with no instructions for those who may need assistance. Overall a good product and value.

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-03-20*