---
product_id: 53166472
title: "iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White"
brand: "ispring"
price: "€ 323.60"
currency: EUR
in_stock: true
reviews_count: 9
category: "I Spring"
url: https://www.desertcart.com.cy/products/53166472-ispring-t55m-5-5-gallon-residential-pre-pressurized-water-storage
store_origin: CY
region: Cyprus
---

# 5.5 gal capacity for ample RO water storage Stainless steel 1/4" NPT valve thread with ball valve Pre-pressurized 7-10 psi for instant water flow iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White

**Brand:** ispring
**Price:** € 323.60
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with pure, pressurized perfection!

## Quick Answers

- **What is this?** iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White by ispring
- **How much does it cost?** € 323.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/53166472-ispring-t55m-5-5-gallon-residential-pre-pressurized-water-storage)

## Best For

- ispring enthusiasts

## Why This Product

- Trusted ispring brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Installation:** Efficient discharge in both vertical and horizontal positions with included tank stand for flexible setup.
- • **Food-Grade Butyl Diaphragm:** Ensures tasteless, odorless water with post-cure processing for pure hydration.
- • **NSF/ANSI Certified Quality:** Independently tested and certified for safety and performance, trusted by top RO brands.
- • **Premium 5.5 Gallon Capacity:** Generous water storage to keep your RO system running longer without interruptions.
- • **Durable Stainless Steel Valve:** Corrosion-resistant 1/4" NPT valve with included ball valve for secure, leak-free connections.

## Overview

The iSpring T55M is a 5.5-gallon pre-pressurized water storage tank designed specifically for residential reverse osmosis systems. Featuring a food-grade butyl diaphragm and stainless steel valve, it delivers tasteless, odorless water with reliable pressure between 7-10 psi. Certified to NSF/ANSI standards, this tank supports efficient water discharge in any orientation and is compatible with most RO systems, making it a trusted upgrade for enhanced water capacity and system performance.

## Description

Metal tank 5.5 gal with 4.0 gal holding capacity, tested by independent third-party to meet NSF/ANSI Standard. Stainless steel connector 1/4 inch NPT, food grade materials. Special designed for RO applications. Discharges efficiently in a vertical or horizontal position. Tank stand included. Compatible with most reverse osmosis systems (including name brands) in the market.

Review: Great Tank, Great Customer Service - This is a large 20 gallon tank that holds roughly 14 gallons of clean water for a reverse osmosis system. As a disclaimer, this arrived dented for me, but Sean from iSpring's customer service was wonderful to work with, and he quickly sent a replacement tank that arrived in perfect condition. This has multiple connectors provided, and the connections are done at the BASE of this unit. This works best with 3/8" line. The top part of the tank is where the bladder is, and the water sits near the bottom. This arrives charged and almost ready to use. They recommend flushing this once filled to ensure it is clean. I HIGHLY you do that with tap water prior to using. This takes forever to fill with RO water, so tap is much faster. Enough connectors were provided that I was able to hook this up to a utility sink to fill and drain this several times before install. This works just as well as smaller tanks, but the pressure is maintained much longer with this size tank. Overall, I am very happy with the performance and value of this tank.
Review: Excellent product! - Excellent quality and performance...improved my RO system's capacity and pressure dramatically! Easy to install and the process was very simple.

## Features

- 5.5 gallon metal pressurized tank
- Made from food grade butyl diaphragm with post-cure procedures provides a tasteless and odorless water chamber
- Stainless steel 1/4" NPT valve thread, Ball Valve Included
- Discharges effectively in both vertical and horizontal position
- Pre-pressurized between 7-10 psi for common use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01CES39N0 |
| Best Sellers Rank | #6,084 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Under-Sink & Countertop Filtration |
| Brand | iSpring |
| Date First Available | March 1, 2016 |
| Global Trade Identification Number | 00662425080236 |
| Installation Type | Under Sink |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8.63 pounds |
| Item model number | T55M |
| Lower Temperature Rating | 40 Degrees Fahrenheit |
| Manufacturer | iSpring Water Systems |
| Model Name | T55M 5.5 Gallon Residential |
| Package Information | Can |
| Product Dimensions | 17"L x 12"W x 12"H |
| Special Feature | NSF certified |
| Supported Water TDS Level Maximum (PPM) | 1000 |
| UPC | 662425080236 |
| Upper Temperature Rating | 100 Degrees Fahrenheit |

## Product Details

- **Brand:** iSpring
- **Capacity:** 5.5 Gallons
- **Included Components:** Tank, Parts
- **Installation Type:** Under Sink
- **Material:** Metal tank
- **Model Name:** T55M 5.5 Gallon Residential
- **Package Information:** Can
- **Product Dimensions:** 17"L x 12"W x 12"H
- **Purification Method:** Reverse Osmosis
- **Special Feature:** NSF certified

## Images

![iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White - Image 1](https://m.media-amazon.com/images/I/51evSYgGNhL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Can I connect 2 tanks together for more water storage?**
A: I put two 3.2 gal tanks together with a tee last month. It works fantastic!!

**Q: Anyone know if this will work for Whirlpool RO systems?  The support rep told me any RO tank would work.  Anyone use this for another system?**
A: I don't think it matters what RO system you have.  If it has the option for a reserve tank and the fitting works, then it should fill with water.

**Q: What is the pressure rating for the tank. Can it handle 60 psi?**
A: Remember that the RO system water valve regulates the "internal" pressure, so the tank is not going to see the actual water line pressure. Most valves operate at 65%, so if your water line pressure is 60 psi, the pressure at the tank generally won't be more than 40 PSI. In most setups you'd need the pressure on the water line to be around 92 PSI to get 60 PSI on the tank.

**Q: What is the diameter of the 5.5 gal tank?**
A: Thanks for the question! The diameter of the tank is 12" x 16" (H)

Kindest,
iSpring Team

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Tank, Great Customer Service
*by A***H on March 20, 2025*

This is a large 20 gallon tank that holds roughly 14 gallons of clean water for a reverse osmosis system. As a disclaimer, this arrived dented for me, but Sean from iSpring's customer service was wonderful to work with, and he quickly sent a replacement tank that arrived in perfect condition. This has multiple connectors provided, and the connections are done at the BASE of this unit. This works best with 3/8" line. The top part of the tank is where the bladder is, and the water sits near the bottom. This arrives charged and almost ready to use. They recommend flushing this once filled to ensure it is clean. I HIGHLY you do that with tap water prior to using. This takes forever to fill with RO water, so tap is much faster. Enough connectors were provided that I was able to hook this up to a utility sink to fill and drain this several times before install. This works just as well as smaller tanks, but the pressure is maintained much longer with this size tank. Overall, I am very happy with the performance and value of this tank.

### ⭐⭐⭐⭐⭐ Excellent product!
*by N***D on January 21, 2026*

Excellent quality and performance...improved my RO system's capacity and pressure dramatically! Easy to install and the process was very simple.

### ⭐⭐⭐⭐⭐ What oily residue? Simple fix, thoughts.
*by C***. on June 2, 2018*

Edit 2: It's November 2023, 5 years later, still working A-OK. The espresso habit acquired last year now also demands tasty water, lol. Edit: 2.5 years and three sets of filters later, still no issues to report. I made a couple tweaks below. Read #1 - very important! This is a great filter for anyone who wants to leave the good minerals in your water and filter everything else out. The only better filtration is reverse osmosis, but it needs its own separate storage tank so the water is just room temperature, and it has a metallic taste and low water pressure = slow flow. After significant research we decided on this filter for all the reasons above. This fit the bill perfectly with a healthy four filtration stages, great flow and no RO! I had it running in a half an hour with simple inline connections to the 'fridge water line and it eliminated the pesticides and city water taste instantly. Important Notes: #1) This one tip might save you from expensive plumbing repairs down the line and is something you need to know before you install this unit. TEST YOUR WATER PRESSURE! This filter needs to be run at under 80 PSI. There are various $10 simple screw-on testers like the Watts IWTG that take seconds to use. I attached the tester to our backyard hose hook-up and discovered we were at 80 PSI. We then tested my in-laws' house and they were at 92 PSI. No big deal right? Well residental water pressure should be under 60 PSI, ideally 50 to prevent water hammer (banging pipes) and damage to copper plumbing pipes over time! After installing a water pressure regulator on the main water line in the basement ($100 from local hardware store and a couple hours' work) we immediately noticed the pipes wouldn't bang when we flushed a toilet, or when the clothes washer ran. Plus, the filter was now right in its sweet spot of 40-80 PSI. If your water pressure is over 60 PSI, at the very least add the iSpring APR40 to your purchase to reduce the pressure to this filter to 40 PSI and help protect it from damage. #2) As others have mentioned there is a slight oily sheen in the water upon first installation. The oil is there to help seal the cartridges. Simply run 15 gallons of water through the filter to purge it all out, really not a big deal, see images 2-3. Residue and cloudiness are common to nearly ALL water filters upon first installation and the 1-star complaints are indicative of inexperienced DIYers. #3) The included push-to-fit 1/4" water line couplers work on both Copper and PEX/plastic tubing as they are both relatively soft materials with the same outer diameter Water tastes like bottled now and we're extremely satisfied, plus no more pesticides. If I have any problems, you know where I'll be posting them!

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-01*