# iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank

The iSpring T20M is a pre-pressurized storage tank for reverse-osmosis systems, with a listing capacity of 20 gallons and title-claimed water storage capacity of 14 gallons. Its substantial listed dimensions make installation space and the capacity distinction important to check before buying.

- [Original product page](https://best-deals.pro/product/ispring-t20m-pre-pressurized-ro-storage-tank)
- [View offer](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- Market: US
- Language: en-US
- Currency: USD
- Brand: iSpring
- Model: 20 Gallon Pre-Pressurized Water Storage Tank for Reverse Osmosis \(RO\) Systems
- Category: Tools & Garden > Electrical & Plumbing
- Price: 166.99 USD
- Previous price: 218.99 USD
- Discount: 24%
- Price checked: 2026-11-14T07:05:15.783Z
- Rating: 4.6 / 5
- Reviews: 7329

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Manufacturer feature copy says the tank can be positioned vertically or horizontally.
- The listing claims NSF certification and describes third-party testing to meet NSF and ANSI Standards.
- The tank is intended to store reverse-osmosis water, rather than perform filtration itself.

## Pros

- The manufacturer describes vertical or horizontal operation, which may give more options when planning the installation.
- Customer feedback reports easy installation and strong RO faucet pressure, though experiences are individual and not guaranteed.

## Cons

- The listed dimensions and weight may make placement challenging in a typical under-sink cabinet.

## Specifications

### Identity
- Brand: iSpring
- Model: 20 Gallon Pre-Pressurized Water Storage Tank for Reverse Osmosis \(RO\) Systems
- Model number: T20M
### Capacity and use
- Listed capacity: 20 gallons
- Installation type: Under Sink
- Purification method: Storage RO Water
- Maximum supported water TDS level: 500
### Dimensions and installation
- Dimensions listed: 16"L x 16"W x 30"H
- Weight listed: 14.5 kg
- Positioning: The tank works efficiently in either vertical or horizontal position
### Materials and protection
- Material listed: Stainless Steel
- Special feature: NSF certified
- Lower temperature range: 40 °F
- Upper temperature rating: 100.12 °F

## Before you buy

- Listing details are inconsistent: the title claims 14 gallons of water storage while the specifications list a 20-gallon capacity. The listing also calls the unit under-sink but gives dimensions of 16"L x 16"W x 30"H. Confirm the capacity measurement and available installation space before purchase. Customer feedback also reports bladder durability concerns and mixed experiences with tubing-connection leaks, which are reported experiences rather than confirmed defects.

## In the box

- RO tank (Included)
- Shut-off valve (Check selected pack): Manufacturer feature copy says this is included. Confirm the selected listing's package contents.
- Tank connector (Check selected pack): Manufacturer feature copy says this is included. Confirm the selected listing's package contents.
- Tank stand (Check selected pack): Manufacturer feature copy says this is included. Confirm the selected listing's package contents.

## A good fit for

- RO system owners seeking a pre-pressurized water storage tank and able to accommodate its listed dimensions.
- Buyers who can use either vertical or horizontal placement and want a tank rather than a complete RO filtration system.

## Less suited to

- Buyers who need a compact tank for a restricted under-sink cabinet.
- Buyers who require a confirmed usable storage volume before ordering, since the listing gives both 14- and 20-gallon claims.

## Customer feedback

Customer feedback highlights perceived quality, ease of installation and water pressure at the RO faucet, while some customers report bladder durability concerns and experiences with tubing-connection leaks are mixed. Reports of more than four gallons when fully charged give some context for actual water availability, but do not resolve the listing's conflicting 14- and 20-gallon capacity figures. These are customer reports, not guaranteed outcomes.
- Positive themes: Customers describe the tank as good quality and easy to install.
- Positive themes: Some customers report strong water pressure from the RO faucet and useful water capacity.
- Negative themes: Some customers report bladder failure after a couple of years.
- Mixed feedback: Leakage experiences vary, including reports of trouble at tubing connections and reports of no leakage.

## Frequently asked questions

### Is the tank's storage capacity 14 or 20 gallons?
The title claims 14 gallons of water storage capacity, while the specifications list 20 gallons. These are conflicting listing details, so confirm the applicable capacity before buying.
### Can the tank be installed horizontally?
The manufacturer says it works in either vertical or horizontal position. Allow for the listed dimensions and confirm that your installation and connections accommodate the chosen position.
### Does this tank filter water?
The listing describes it as storing RO water. It is a storage tank, not a complete reverse-osmosis filtration system.
### What comes with the tank?
The listing's included-components field names an RO tank. Feature copy also claims a shut-off valve, tank connector and tank stand are included, so check the selected listing's package details for those items.

## Alternative options

- [iSpring RCC7-BN NSF Certified, High Capacity Under Sink 5-Stage Reverse Osmosis Water Filter, RO Drinking System, 75 GPD Brushed Nickel Faucet, Patented Top-Mounted Faucet Design for Easy Installation](https://best-deals.pro/visit/ispring-rcc7-bn-5-stage-under-sink-ro-system)
- [iSpring RCS10T Tankless Reverse Osmosis System, 1000 GPD, 5-Stage \| 2.5:1 Pure-to-Drain Ratio, Built-In Booster Pump, for Residential and Light Commercial Use](https://best-deals.pro/visit/ispring-rcs10t-tankless-reverse-osmosis-system)
- [iSpring RO500-BN, NSF Certified Tankless RO Reverse Osmosis Water Filtration System, 500 GPD Fast Flow, Brushed Nickel Faucet, 2:1 Pure to Drain Ratio, White](https://best-deals.pro/visit/ispring-ro500-bn-tankless-reverse-osmosis-filter)
- [iSpring RO800G+UVF8 Tankless Reverse Osmosis System with LED UVF8 Light, 800 GPD Fast Flow RO System, 2.5:1 Pure to Drain Ratio RO Water Filter System, Brushed Nickel Faucet](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [NU Aqua 7-Stage \(12-Step Filtration\) UV + Alkaline RO Water Filter System \| Under Sink 100 GPD Fast Flow Rate, Includes Faucet & Tank, PPM Meter, Easy Install, Remineralization Kitchen Water Filtration](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [iSpring US31 3-Stage Under Sink Water Filter System with Faucet, 1 Year \| 10000 Gal, NSF/ANSI Certified Filters, Reduces Chlorine, Sediment, and Harmful Chemicals, SGS-Tested, 5–10 Years Housings](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [iSpring RCC1D Tankless RO/DI System - 5-Stage, 150 GPD for Aquarium \| De-ionization removes 1000+ contaminants. 0 TDS ultra-pure water. Space-saving tankless design. Ideal for aquariums, labs](https://best-deals.pro/visit/ispring-rcc1d-tankless-ro-di-system)
- [iSpring RCC7AK-BN NSF Certified, 75 GPD, Alkaline 6-Stage Reverse Osmosis System, pH+ Remineralization RO Water Filter System Under Sink Patented Top-Mounted Faucet Design for Easy Installation](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [iSpring RO500AK-ORB Reverse Osmosis Water Filter, 500 GPD with Alkaline \| Under Sink Tankless RO Water Filter, Fill 8 oz in 10 s, 2:1 Low Drain Ratio, TDS PFAS Reduction, Auto Flush, Filter Reminder](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [iSpring RCC7P-AK, 6-Stage Reverse Osmosis System Under Sink Alkaline Water Filter and Pump, RO Drinking Water Filtration System, Patented Top-Mounted Faucet Design for Easy Installation](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [iSpring WCFM400K Whole House Iron and Manganese Water Filter System, Digital Control with Automatic Regeneration & Air Injection, Set & Forget Design](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)
- [Bluevua RO100ROPOT-Lite Countertop Reverse Osmosis Water Filter \| 3:1 Pure to Drain Ratio, Portable RO Filtration with Remineralization, WQA & NSF Certified](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)

## Add-ons

- [15FT 3/8" O.D.RO Water Tubing & 3/8" Quick Fittings for RO Filter System \| NSF Certified,BPA-free Flexible Plastic Hose\(Blue\),No Leak Quick Fittings&Cutter for High Flow Drinking Water Filter System](https://best-deals.pro/visit/ispring-t20m-pre-pressurized-ro-storage-tank)

## Images

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 1](https://best-deals.pro/i/yqPYzHe0B9qu5-bBaf0g17nwS-EguN7I1uBP3RKvSSCKjK_pXbl_qer93ZFllN9Ki8i-alz2wFjoLUdLqZXKXlaqqrNHNbHGECTPaHDbjLmDwoqDEYsL.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 2](https://best-deals.pro/i/cY-ZaqDUOshR2CL52FNFJD_gn9h93-9o-BUAjM7N6m73n-EMHGGtM7DJaHB7KhzhPtFFQDXcglBofEDWjhbILdhgwrcFuU0cCOETWQHYJyHmmeH9PYlb.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 3](https://best-deals.pro/i/FGBL3ddwDo4bPTuuWiFFhWsdQUDWuxnKtrHBLfyQvuYkqaD-665Ci00Fl89zTuBXPmy4r8AWlgMtxBjdNNq-xgLOGefL6ZvB0lgs8mj5HrAEWLXPS8hb.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 4](https://best-deals.pro/i/oFBdlvloN1TAw5jIjCWRhxFtcXnr9LAqGG-4FD0h7434_2kxuuM7dFMy8-iYYiOCKGHYqFmThtnU2r6xyNTq_9cb8ySwW_t344H7HQlqMTDg1BoGHewR.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 5](https://best-deals.pro/i/W79E7xmv4xZhBvj7JLzaCN3aT1rrtivyl-vcYf8LANy7TOROvo681eBYduyFTrHidpUMc9oPTdTQ4hMyLzjVknKkUa3RE3hel8-UOvF0GHoQ5FyM6iow.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 6](https://best-deals.pro/i/0nwwbLagnPzsZ9lvpfBTeGgrnEA0Z9l0FyvpuqdhW--on2xOPUgs7b91AOA2hCC1Byq1lwKCOqsgY8Hh-pfPnAdM1D-xXwbJdF59EauFG85h7PGohMfU.jpg)

![iSpring T20M 20-Gallon Pre-Pressurized RO Storage Tank — 7](https://best-deals.pro/i/A37BWUxfBFHtEsFcby87mnaC3ZPoa90gRplu0CdrFyXAkBXU2rZMqJD2hrVL2EtUxPdQZSE5E-7U7mvyY4A-P6rSJrAF31lTOi7q7uR3DSujZ57UARRu.jpg)