Can I connect 2 tanks together for more water storage?

I put two 3.2 gal tanks together with a tee last month. It works fantastic!!

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?

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.

What is the pressure rating for the tank. Can it handle 60 psi?

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.

What is the diameter of the 5.5 gal tank?

Thanks for the question! The diameter of the tank is 12" x 16" (H) Kindest, iSpring Team

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iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White

iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems , White

Product ID: 53166472

Details

Brand
iSpring
Capacity
5.5 gallons
Included Components
Tank Parts
Installation Type
Under Sink
Item Weight
4.3 kg
Material
Metal tank

💧5.5 gallon capacity

⚙️Pre-pressurized 7-10 psi

🛡️Food-grade butyl diaphragm

¥59340

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay hydrated, stay ahead — the tank that keeps your water pure and your lifestyle seamless.

VERSATILE INSTALLATION - Works flawlessly in both vertical and horizontal positions to fit your space perfectly.
OPTIMAL 5 5 GALLON CAPACITY - Generous water storage to keep your RO system flowing without interruption.
PREMIUM FOOD GRADE DIAPHRAGM - Tasteless, odorless water chamber guarantees pure, fresh water every time.
DURABLE STAINLESS STEEL VALVE - 1/4" NPT valve with included ball valve for reliable, leak-free performance.
PRE PRESSURIZED FOR INSTANT FLOW - 7-10 psi pressure ensures water is ready when you are—no waiting, no hassle.

The iSpring T55M is a 5.5 gallon pre-pressurized metal water storage tank designed for residential reverse osmosis systems. Featuring a food-grade butyl diaphragm and stainless steel valve, it delivers tasteless, odorless water with reliable pressure (7-10 psi). Its versatile design supports both vertical and horizontal installation, making it a top-rated, NSF-certified choice for clean, convenient water storage.

Specifications

ASIN	B01CES39N0
Best Sellers Rank	#4,345 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in Under-Sink & Countertop Filtration
Brand Name	iSpring
Capacity	5.5 gallons
Container Type	Can
Customer Reviews	4.6 4.6 out of 5 stars (7,252)
Global Trade Identification Number	00662425080236
Included Components	Tank, Parts
Installation Type	Under Sink
Item Dimensions L x W x H	17"L x 12"W x 12"H
Item Type Name	Pre-Pressurized Water Storage Tank for Reverse Osmosis (RO) Systems
Item Weight	4.3 kg
LowerTemperature Range	40 °F
Manufacturer	iSpring Water Systems
Material Type	Metal tank
Model Name	T55M 5.5 Gallon Residential
Model Number	T55M
Number of Items	1
Other Special Features of the Product	NSF certified
Part Number	T55M
Purification Method	Storage RO Water
Supported Water TDS Level Maximum (PPM)	1000
UPC	662425080236
Unit Count	1 Count
Upper Temperature Rating	100 °F

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