what country made in?

They’re made in Taiwan per the printing on the box which the tank arrived within.

4 gallon okay in place of 3.2 gallon tank

Yes I bought the 4.o gallon unit and it works fine. I checked the pressure in the tank and had to pump it up to 8.0 psi for my system.

Will this work with a watts WP-4V and similar systems?

It is a universal unit and will work with all RO systems. It may require an adopter based on tube size. Thx

has anyone checked their stored water for leeching chemicals?

i have had my water checked for LEAD recently, no issues

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Ro Expansion Tank 4 Gallon - Nsf Certified Compact Reverse Osmosis Storage Pressure By Tankro With Free Ball Valve

Product ID: 256980379

Details

Brand
Express Water
Capacity
4 Gallons
Material
Alloy Steel
Product dimensions
38.1L x 30.5W
Special features
NSF certified

💧3.2 gal water capacity

🛠️1/4" quick connect valve

🛡️NSF certified & 1-year warranty

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VT68593

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Description

💧 Elevate your hydration game with pure, pressurized perfection!

COMPACT UNDER SINK FIT - Designed to seamlessly tuck under most kitchen sinks (15x12x12 inches) for sleek, space-saving installation.
PURE SAFE WATER STORAGE - Crafted from 100% food-grade materials with a post-cured diaphragm to ensure tasteless, odorless, contaminant-free water every time.
VERSATILE WEATHER RESISTANT - Two-part epoxy primer and polyurethane paint finish protect against outdoor elements, making it ideal for both indoor and outdoor use.
EFFORTLESS SETUP MAINTENANCE - Includes a free tank ball valve with 1/4" quick connect design for fast, tool-free installation and hassle-free replacements.
BUILT TO LAST WITH COMMERCIAL STRENGTH - Durable deep-drawn steel domes and precision welded seams withstand up to 100 PSI, backed by rigorous quality testing and a 1-year warranty.

The Express Water Ro Expansion Tank is a compact, NSF-certified 4-gallon reverse osmosis storage tank designed for under-sink installation. Made from 100% food-grade materials and durable steel with precision welding, it ensures contaminant-free water storage with a 3.2-gallon capacity. Featuring a free 1/4" quick connect ball valve and a robust build rated for 100 PSI, this tank offers easy installation, long-lasting durability, and reliable performance backed by a 1-year warranty.

Specifications

ASIN	B00Q798N8E
Best Sellers Rank	#172,998 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #364 in Under-Sink Water Filters
Brand	Express Water
Brand Name	Express Water
Capacity	4 Gallons
Container Type	Dispenser
Customer Reviews	4.6 out of 5 stars 2,097 Reviews
Global Trade Identification Number	00641990965834
Included Components	Tank Ball Valve, Tank Stand
Included components	Tank Ball Valve, Tank Stand
Installation Type	Under Sink
Item Dimensions L x W x H	38.1L x 30.5W x 30.5H centimeters
Item Weight	7.65 Pounds
Manufacture Year	2022
Manufacturer	Express Water Inc
Material	Alloy Steel, Polypropylene, Polyurethane
Material Type	Alloy Steel, Polypropylene, Polyurethane
Model Name	RO132-TNK
Model Number	RO132-TNK
Other Special Features of the Product	NSF certified
Power Source	Water Pressure
Product dimensions	38.1L x 30.5W x 30.5H centimeters
Purification Method	Reverse Osmosis
Special features	NSF certified
Supported Water TDS Level Maximum (PPM)	1000
UPC	641990965834
Unit Count	1 Count
Upper Temperature Rating	100 Degrees Fahrenheit

Reviews

A**A

23.07.2021

D**N

10.02.2026

S**T

12.04.2026

R**T

9.04.2026

S**O

2.03.2026

S**Y

17.03.2026

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