Pressurized 4.0 Gallon RO Storage Tank

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Product Features

Pressurized Storage Tank

Precharged for ease of use

Stainless Steel

High quality stainless steel resists corrosion and avoids leeching concerns

4 Gallon Size

Storage capacity approximately 3.2 gallons depending on pressure and system configuration

1/4" Connection

Standard connection uses common ball valve included with most RO systems

NSF Approved

Meets NSF Standard 58

Versatile Design

Tank can be used vertically or horizontally and includes stand for vertical use


Diameter - 11"
Height - 14"
Weight (empty) - 10 lb

Product Description

Typical reverse osmosis systems produce water at a very slow rate, which requires long waits when filling a glass or getting water for cooking. Storage tanks are used to hold the purified water and deliver it at a reasonable rate, allowing much quicker water collection.

Pressurized storage tanks are the tank of choice for RO systems for multiple reasons. Pressurized storage tanks are closed, reducing contaminate risks, and do not require the use of a delivery pump for short (10-15 ft) supply lines.

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5 Reviews

  • 5

    Posted by Rich Costanzo Sr on Sep 29 2023

    Converted my RO/DI reef system to a drinking water fridge icemaker. This storage tank was the answer to my volume issues.

  • 5
    Pressurized 4 Gallon Ro Storage Tank

    Posted by Sherry Coulter on Sep 7 2020

    Works Great

  • 5
    Easy to install. Works as advertised.

    Posted by Roger Schultz on Aug 27 2019

    Why didn't you tell me about the air valve core behind the blue cover. * from AFW: the air valve is if you need to adjust, it comes pre charged and typically you never need to change anything there*

  • 5
    Storage tank

    Posted by Crystal K. Preston on Jan 17 2019

    It works great after replace it for the 1st tank was 13 years old. Happy Lady!

  • 5
    Excellent Tank and Reasonable Price!

    Posted by Bob on Oct 19 2017

    Changing our RO storage tank was just what we needed. Increased flow and storage.

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