Top 10 Best ro tank in 2026

Last Updated - 6/20/2026

🏆Best Choice

EXPRESS WATER

tankRo RO132-TNK RO Water Filtration System Expansion Tank 4 Gallon Capacity – NSF Certified – Compact Reverse Osmosis Water Storage Pressure Tank 1/4" Tank Ball Valve

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Reverse Osmosis Tank: Keeps your water free from any impurities and harsh chemicals. The perfect addition to any RO water system.
•Easy to Install Water Tank: RO tank replacements include free tank ball valve for easy set-up and replacement with 1⁄4” quick connect design.
•Every water tank is rigorously tested for quality and durability.
•High Quality Water Tank: This water storage tank is made from durable deep-drawn steel domes with precision welding to ensure long lasting value for your RO water system
•Water Tank Dimensions: This compact water tank is designed (15 x 12 x 12) to fit under most kitchen sinks. Stores up to 3.2 gallons of water for on-demand filtered drinking water.

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$39.99

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iSpring

iSpring T32M Pressurized Water Storage Tank with Ball Valve for Reverse Osmosis RO Systems, 4 Gallon, 1/4" Tank Valve Included, White

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Metal pressurized tank with up to 3.2 gallon holding capacity
•Made from food grade butyl diaphragm with post-cure procedures provides a tasteless and odorless water chamber. Tested by independent third-party to meet NSF/ANSI Standard
•Stainless steel 1/4" NPT valve thread, 1/4-inch tank valve Included
•Discharges effectively in both vertical and horizontal position
•Pre-pressurized between 7-10 psi for common use

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$48.26

$51.99

-7%

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Waterdrop

Waterdrop PMT Small Water Pressure Tank, RO Pressure Tank for All Tankless Reverse Osmosis System, Mini Reverse Osmosis Storage Tank Fits All 1/4" Water Tubing, Small Water Tank for G3, G2, D6, PD600

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•𝐂𝐨𝐧𝐯𝐞𝐧𝐢𝐞𝐧𝐭 𝐈𝐧𝐬𝐭𝐚𝐥𝐥𝐚𝐭𝐢𝐨𝐧: The user manual provides simple instructions on how to install this water pressure tank. You get a 1/4"quick-connect design out-of-the-box. All you have to do to complete the installation is to cut off the water outlet tubing of the tankless RO water filter systems, then insert both ends of the tubing into the tank. If your water pipe is 3/8", please contact customer service.
•𝐐𝐮𝐢𝐜𝐤-𝐟𝐢𝐭𝐭𝐢𝐧𝐠 𝐥𝐞𝐚𝐤𝐚𝐠𝐞:After installation, please confirm if PE pipe is cut smoothly. If not, cut the tubing squarely and cleanly. Make sure the tubing is fully inserted.
•𝐋𝐞𝐚𝐤𝐚𝐠𝐞 𝐛𝐞𝐭𝐰𝐞𝐞𝐧 𝐛𝐚𝐥𝐥 𝐯𝐚𝐥𝐯𝐞 𝐚𝐧𝐝 𝐭𝐡𝐞 𝐭𝐚𝐧𝐤: Please check if there is a washer connecting the ball valve, if not, please contact us for a new ball valve.
•𝐖𝐚𝐭𝐞𝐫 𝐝𝐨𝐞𝐬𝐧'𝐭 𝐜𝐨𝐦𝐞 𝐨𝐮𝐭: Please check if the internal membrane breaks. Unsrew off the stem and you will see a protruding charging valve, then press the charging valve. If water flows out, it indicates the internal membrane breaks. Please change a new storage tank. If no water flows out, please contact customer service.
•𝐍𝐎𝐓𝐄: If you connect ro system to refrigerator through the mini tank, replace the filter in your refrigerator with bypass.

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$32.99

$35.99

-8%

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tankRo

tankRo 3 Gallon RO Expansion Tank – Compact Reverse Osmosis Water Storage Pressure Tank with Free Tank Ball Valve

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Reverse Osmosis Tank: Made from 100% food grade materials, this RO water tank stores and keeps your water free from any impurities and harsh chemicals. The perfect addition to any RO water system.
•Easy to Install Water Tank: RO tank replacements include free tank ball valve for easy set-up and replacement with 1⁄4” quick connect design.
•Durable Water Storage Tank: This RO water tank is rigorously tested for quality and durability and includes a 1-year warranty.
•High Quality Water Tank: This water storage tank is made from durable deep-drawn steel domes with precision welding to ensure long lasting value for your RO water system.
•Water Tank Dimensions: This compact water tank is designed (14 x 9 x 9) to fit under most kitchen sinks. Stores up to 2.2 gallons of water for on-demand filtered drinking water.

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$39.99

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SimPure

SimPure Small Water Pressure Tank for Tankless Reverse Osmosis System, RO Water Storage Tank with Fittings for Refrigerator, Ice Maker, Suitable for 1/4" and 3/8" Water Pipes

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•ENHANCED PERFORMANCE of TANKLESS RO SYSTEM: The compact water pressure tank from SimPure is engineered to boost the capabilities of tankless RO systems. It ensures smooth coordination with the refrigerator and ice maker, cutting down on the need for frequent reboots. It extends the reach of the RO system to guarantee continuous water flow and ice supply, enabling quick access to water without any waiting
•NSF CERTIFIED and TESTED: The reverse osmosis tank has been tested and certified by NSF, meets the NSF/ANSI 58 Standard, and complies with material and structural integrity requirements. Each pressure tank undergoes rigorous quality and durability testing, ensuring exceptional quality and performance. This water storage tank is crafted from a food-grade butyl diaphragm, providing a tasteless and odorless water chamber that keeps your water free from impurities and harsh chemicals
•SIMPLE INSTALLATION: The user manual provides clear and easy-to-follow instructions for installing the water pressure tank. The RO tank includes all necessary fittings for effortless connection to the refrigerator or ice maker, it can be set up with 1/4" and 3/8" water pipes, which is a perfect addition to any RO water system
•SPACE-SAVING DESIGN: The small pressurized tank features a compact size (Φ 6.6*9.2) with a 1.4L capacity, saving under-sink space and eliminating the need for a tank stand. It is the perfect fit for all tankless RO systems, including T1-400UV, T1-400ALK, Q3-600, G3P600, G2P600, G3P800, G2, G3, D6, D4, PD400, PD500, PD600, PX500, KFL-X6, PL400G, CUW4, etc
•SERVING USA SINCE 2006: Seattle, WA USA, SimPure is dedicated to providing world-class quality water filtration solutions. If you are not satisfied with your purchase, then we want to hear from you. Please contact our trained water specialists. And is available to answer any questions during the life of the product

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$35.99

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Neo-Pure

Neo-Pure Reverse Osmosis Storage Tank | 4.5 Gallon Powder-Coated Steel | Includes Tank Valve & Female Elbow 1/4" FPT x 3/8" Quick-Connect | Durable Stainless Steel Construction

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Stainless steel water connection High-grade chlorobutyl diaphragm Virgin polypropylene liner Plastic tank stand included CE approved BPA free
•A tank shut-off valve is included to connect the tank to your reverse osmosis system and control the flow of water into and out of the tank.
•The valve is also essential for performing system service or maintenance.
•High-quality virgin polypropylene liner ensures water remains tasteless, odorless, and free from contaminants.
•Advanced chlorobutyl diaphragm, post-cured for enhanced performance and long-term reliability.
•Reliable and efficient design, ideal for both residential and commercial reverse osmosis systems.

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$39.73

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APEC WATER

APEC TANK-14 14 Gallon Pre-pressurized Reverse Osmosis Water Storage Tank

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Pre-pressurized 14 Gallon Reverse Osmosis RO Water Storage Tank (holds up to 10.7 gallons of water)
•Discharge efficiently in a vertical or horizontal position with tank stand.
•Food grade bladder and NSF Certified to ensure quality, safety and durability
•Upgrade for small 4 gal tanks- holds 3X more water with improved faucet delivery pressure
•Larger 3/4” male NPT Inlet/Out connection for faster tank refills and flow rate

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$124.95

$139.99

-11%

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Neo-Pure

Neo-Pure Reverse Osmosis Storage Tank - White Powder-Coated Stainless Steel, RO Water Tank, Durable and Resistant for Filtration Systems (White, 3.2 Gallon)

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Stainless steel water connection High-grade chlorobutyl diaphragm Virgin polypropylene liner Plastic tank stand included CE approved BPA free
•High-quality virgin polypropylene liner ensures water remains tasteless, odorless, and free from contaminants.
•Advanced chlorobutyl diaphragm, post-cured for enhanced performance and long-term reliability.
•Reliable and efficient design, ideal for both residential and commercial reverse osmosis systems.
•Advanced chlorobutyl diaphragm, post-cured for enhanced performance and long-term reliability.
•Reliable and efficient design, ideal for both residential and commercial reverse osmosis systems.

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$28.52

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Neo-Pure

Neo-Pure Reverse Osmosis Storage Tank - 4.5 Gallon Black Coated Steel, RO Water Tank, Durable and Resistant for Filtration Systems

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Stainless steel water connection High-grade chlorobutyl diaphragm Virgin polypropylene liner Plastic tank stand included CE approved BPA free
•The valve is also essential for performing system service or maintenance.
•Maintenance Free. The ROT-4.5 tank is built with a sealed brass air valve and o-ring sealed cap to ensure a leak-free air chamber, meaning no more checking the air precharge.
•High-Quality Construction: Features a virgin polypropylene liner, high-grade chlorobutyl diaphragm, and stainless steel 1/4" MPT water connection for superior durability and reliable performance. The diaphragm is post-cured to ensure water remains tasteless, odorless, and contaminant-free.
•Leak-Free Design: Equipped with a sealed brass air valve and o-ring sealed cap to provide a leak-free air chamber, maintaining optimal performance and safety for both residential and commercial RO systems.
•NSF/ANSI 58

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$33.28

$37.14

-10%

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APEC WATER

APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Pre-pressurized 4 gallon water storage tank (holds up to 3.2 gallon of water)
•Discharge efficiently in a vertical or horizontal position with tank stand
•Food grade bladder and certified to ensure quality, safety and durability
•Inlet/outlet connection: 1/4 inch male pipe thread. Special designed for ro application

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$39.95

$41.90

-5%

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