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Your cart is empty.The tankRO 4 Gallon Water Storage Tank gives tasteless, odorless, and contaminant free water. Get a quality tank you can rely on today. The post cured diaphragm means sterile water distribution to keep your water safe. The water reservoir can hold up to 3.2 gallons of water at once, with the rest of the storage area being occupied by the pre pressurized air bladder, which helps you draw water from the tank. This tank comes with a free Tank Ball Valve and a free Tank Stand. All components are NSF Certified. Designed to fit under sinks this water holding tank will fit most kitchen cabinets, it is made to work when lying on its side or upright. Maximum working pressure of the tank is 100 PSI. The tank is also designed to survive the outdoor elements with a two part epoxy primer and polyurethane paint finish. This is a fully functional pressure tank for water wells. The water accumulator chamber of the tank includes the highest grade of polypropylene, virgin polypropylene, meaning you have the most durable and smooth inside lining. This tank is built to last with heavy duty commercial construction with durable deep drawn steel domes and precision welded seams. Improve your water today.
pumpman
Reviewed in the United States on March 4, 2025
This 4 gallon tank was a great replacement for my 2 gallon tank. We now have plenty of water from our reverse osmosis system to fill our water pitchers and coffee pot when we need it. Very simple change over simply unscrew the one fitting and screwed it onto the new. The tank was pre-charged with air to the right specification. I would recommend this tank to anyone. It was cheaper than the ones that I've seen on the websitesat Lowe's or Home Depot and they didn't have them in stock.
Ronnie Cooper
Reviewed in the United States on March 26, 2025
I had a small tank and wanted to go bigger.
FTroxell
Reviewed in the United States on March 19, 2025
Worked great to replace a tank with a ruptured bladder inside. Easy to install.
Ratchit
Reviewed in the United States on March 16, 2025
I have a Hague watermax ro system and this worked perfectly. The connector was smaller than my water lines so I did have to reuse my old one
t0winsto
Reviewed in the United States on February 6, 2025
I bought this tank because my old one stopped producing a lot of water. It was failing so I thought I would try a new tank to see if that was the issue. It was! Works great with no issues and my RO system is back to normal.
Carl Burton
Reviewed in the United States on February 13, 2025
Tank works great. Seems to be well made.
Joseph A. Hala
Reviewed in the United States on October 15, 2024
I purchased this same tank as a replacement in 2017 and again in September of 2024. I feel like I got my money's worth out of the tank considering how much filtered water I used daily. There is an inner bladder inflated to keep the water pressure sufficient to dispense. That bladder gives out over time and you will lose the ability to fill containers quickly. I think 7 years is a pretty good run for this price point. Comes with a stand and adapter valve, which I don't need but it may come in handy for others.
ahmed abdulla
Reviewed in the United Arab Emirates on July 23, 2021
I received different brand not same as show in photos.Without back stand and Different Fittings.
L. Kupersmith
Reviewed in the United States on October 16, 2021
Updated Sept. 2023:The tank no longer works - water merely trickles out from my faucet. Lost pressure and won't hold when attempting to re-pressurize it so it seems like the bladder has ruptured.Original review Sept. 2021:Most of these tanks seem to be made by the same factory so I don't really think there's much difference between them. This brand had a good price and was in-stock for fast delivery. I swapped out my bad tank (ruptured bladder) with this new one in about 10 minutes and allowed it to fill and flushed it a few times before using the water. It comes pre-charged so you don't have to pump it up and includes a plastic stand which is convenient. I did have to swap the included fitting since my tubing is 3/8", not the standard 1/4".
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