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Max Water NSF Certified Heavy Duty 4.4 Gallon @100 PSI RO (Reverse Osmosis) Water Storage Tank, PA-E RO-132 + Valve

  • Based on 60 reviews
Condition: New
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Availability: In Stock.
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Arrives Sunday, Mar 1
Order within 2 hours and 52 minutes
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Features

  • Heavy Duty : Max Water NSF Certified tanks are built to last. With 100 PSI max working and a smooth internal air vent cap (to prevent diaphragm damage). This tank is built to last years at a time without the need to change. The tank comes pre charged at 6 PSI.
  • Wide Rage of Application : 1/4" stainless Steel Connection built for Reverse Osmosis water storage tank, pump tank & thermal tank applications.
  • Storage & Dimension : Water storage capacity 4.4 gallon approx @ 100 PSI & 3.2 gallon @ 60 PSI; dimension approx 14" Height , 11" Diameter.
  • Quality Tested: We consistently provide products and services that meet customer quality requirements.
  • Why Max Water : We have 15+ years of experience in water filtration industry providing solution with a smile to millions of families. Make Max Water your solution to all your filtration needs.

Brand: Max Water


Special Feature: Built for heavy duty usage.


Product Dimensions: 11"L x 11"W x 14"H


Material: Stainless Steel


Capacity: 4.4 Gallons


Included Components: Tank with Stand and Valve


Package Information: Bottle


Installation Type: Under Sink


Purification Method: Reverse Osmosis


Power Source: Manual Operation


Brand: ‎Max Water


Special Feature: ‎Built for heavy duty usage.


Product Dimensions: ‎11"L x 11"W x 14"H


Package Information: ‎Bottle


Installation Type: ‎Under Sink


Power Source: ‎Manual Operation


Model Name: ‎4.4ROTank


Upper Temperature Rating: ‎122 Degrees Fahrenheit


Supported Water TDS Level Maximum (PPM): ‎500


UPC: ‎700256129059 680392202239


Global Trade Identification Number: ‎39


Manufacturer: ‎Max Water


Part Number: ‎105006~105137~H


Item Weight: ‎7.73 pounds


Item model number: ‎105006


Size: ‎1 Count (Pack of 1)


Color: ‎White


Shape: ‎Cylindrical


Item Package Quantity: ‎1


Number Of Pieces: ‎1


Special Features: ‎Built for heavy duty usage.


Batteries Included?: ‎No


Batteries Required?: ‎No


Date First Available: March 14, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Mar 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Just as described
Works great, follow the instructions! Our ROS is working correctly now. Saved a lot of money over replacing the whole system.
Reviewed in the United States on June 27, 2025 by John S. Burke

  • Great product highly recommend
Very happy with the performance of this tank. I installed a tankless reverse osmosis system to feed my refrigerator and faucet on the main floor and a refrigerator in my basement bar. The water pressure was unacceptable and I was going to return it until I installed this tank. Pressure at all 3 is better than it was on my old tankless system and I’m very happy with the performance. ... show more
Reviewed in the United States on September 17, 2025 by Derek H

  • A winner, no problems
Perfect repair to replace my old tank with a ruptured bladder. More capacity, heavier construction, no problems to install. Clearly an upgrade l have confidence in.
Reviewed in the United States on January 13, 2026 by RJ J.

  • Reverse Osmosis Expansion Tank
Good service. Well made clear instructions and it solved my problem.
Reviewed in the United States on August 21, 2025 by Joseph P.

  • Replacement water tank with bladder
Worked perfectly, drop in replacement for my last replacement. Hopefully this one will last a while, the quality has been slowly declining over the last few I've bought. Too early to say anything about this one.
Reviewed in the United States on December 18, 2024 by eggehad

  • I have pressure again!
As described. Works beautifully!
Reviewed in the United States on October 9, 2025 by Cully

  • Excellent built quality
Excellent quality take construction. Specification listed for NSF use. Pre pressurized and ready to use. Comes with all the parts needed and packaged well. The water discharge is excellent. Took a long time for it to run out of water. I suggest you do a 3 cycle fill and flush to clear out any micro debris before use. Great value. ... show more
Reviewed in the United States on September 10, 2025 by Mr. M

  • Perfect replacement!
Exactly what I expected and easy to install.
Reviewed in the United States on August 20, 2025 by SMK

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