Search  for anything...

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
Checking for the best price...
$78.95 Why this price?
Save $270.05 was $349.00

Buy Now, Pay Later


As low as $13.16 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Saturday, Jun 13
Order within 4 hours and 33 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Features

  • Heavy Duty & Durable Construction: Max Water NSF Certified tanks are built for long-lasting use. With a max working pressure of 100 PSI and a smooth internal air vent cap to prevent diaphragm damage, the tank provides reliable water storage. Pre-charged at 6 PSI for convenience.
  • Safe, BPA-Free Materials: Made with food-grade, BPA-free plastic components that meet industry standards. Designed to store water safely and reduce potential exposure to plastic contaminants.
  • Quality Tested: Every tank undergoes rigorous quality checks to ensure it meets industry standards for safe and durable water storage.
  • Versatile Applications: Equipped with a 1/4" stainless steel connection compatible with Reverse Osmosis water storage tanks, pump tanks, and thermal tank applications.
  • Optimal Storage & Space-Saving Design: Holds approx. 4.4 gallons at 100 PSI (3.2 gallons at 60 PSI). Tank measures 10.5" diameter 13.5" height (15.75" with valve & base), making it ideal for most under-sink residential RO installations. Actual water output depends on incoming pressure and RO system efficiency. Typical delivery ~3.2 gallons at 60 PSI.
  • Designed to Outperform Standard Tanks: Compared with typical water storage tanks, Max Water tanks offer stronger materials, improved diaphragm protection, and better pre-charged readinessproviding a more reliable and long-lasting solution.
  • 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: 3.2 Gallons


Included Components: Tank with Stand and Valve


Package Information: Bottle


Installation Type: Under Sink


Purification Method: Reverse Osmosis


Power Source: Manual Operation


Other Special Features of the Product: Built for heavy duty usage.


Container Type: Bottle


Installation Type: Under Sink


Purification Method: Reverse Osmosis


Power Source: Manual Operation


Upper Temperature Rating: 122 Degrees Fahrenheit


Supported Water TDS Level Maximum (PPM): 500


Smart Home Compatibility: Not Smart Home Compatible


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


Capacity: 3.2 Gallons


Material Type: Stainless Steel


Brand Name: Max Water


Included Components: Tank with Stand and Valve


Model Name: 4.4ROTank


Model Number: 105006


UPC: 700256129059 680392202239


Global Trade Identification Number: 39


Manufacturer: Max Water


Part Number: 105006~105137~H


Item Type Name: Heavy Duty 4.4 Gallon @100 PSI Pressurized RO (Reverse Osmosis) Water Storage Tank, PA-E RO-132 + Valve


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jun 13

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
  • Affirm Pay in 4
  • 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


  • Easy to install
This tank was easy to install and is working great. The first tank's bladder failed and was only 3.5 years old - I hope this one lasts longer. The product arrived on time and cost about $74.
Reviewed in the United States on May 10, 2026 by Galvininindy

  • Great tank
This tank was perfect. I had no issues with recent install.
Reviewed in the United States on March 24, 2026 by SP

  • 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

  • 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

  • Do first
Note you'll want to implement factory suggestions to hook tank up to the hose the goes into your RO unit which is full house water pressure. Unlike the cheaper thanks this one must have a heavy duty bladder. If you don't stretch it with house water supply it won't hold much water. You'll hear disturbing sounds coming from the tank as bladder stretches. It's ok that's normal. I'm hoping this tank will last allot longer than the 4 years my previous tank lasted. ... show more
Reviewed in the United States on May 4, 2026 by Robert A Renelle

  • I'll buy again. Large enough for a family of 7
Super easy hookup
Reviewed in the United States on June 5, 2026 by Chris w.

  • None
It’s made out of stainless steel so when you ask yourself why this tank cost more then other here you have simple but genius explanation. Other than that this tank is no difference between cheaper version.
Reviewed in the United States on May 7, 2026 by AZ

  • Avoid this company.
Zero stars I purchased this in Oct 2025 and it failed within 4 months. Product was most likely defective but the manufacture will not honor that. Avoid this company at all cost. Under normal use the internal bladder failed and ruptured. The only way to contact them is through a link and not on the phone. A total Waste of money. ... show more
Reviewed in the United States on March 3, 2026 by Kevlar

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...