What is the recommended pressure for this expansion tank?

They come pressurized from the manufacturer with a required 4-6 psi.

What is the size of the male threaded fitting on the top? 3/8"?

Size? Mine is in storage so not sure . The thread is tapered for a tight fit. Check APEC web site. It likely is the 3/8". Appears to be less than 1/2" and for sure more than 1/4"

What is the recommended pressure for this expansion tank?

Label on my tank says 100 psi max. At one point, my tank was not putting out much water. I hooked up a pump which said there was about 20psi in the tank. I charged it to 95 and it works like it did when it was new.

I need replacement tank for my Ecowater ero335. Is this a comparable model. The company here says everything out there is plastic.

I do t know if this will fit your exact model. But it should. just make sure the intake/outtake valve is the same size as your current tank. This one is definitely not plastic and the water has tasted great.

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APEC Water Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank

Product ID: 11011230

Details

Brand
APEC WATER
Capacity
4 gallons
Color
White
Material
Stainless
Product Dimensions
11"L x 11"W x

💧4-gallon pre-pressurized capacity

🔄Vertical & horizontal discharge

🛡️Food-grade, certified bladder

877.56 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Elevate your hydration game with APEC’s premium RO storage tank—because pure water waits for no one.

SAFE PURE EVERY TIME - Food-grade bladder and CE-certified materials ensure your water stays fresh, odor-free, and contaminant-free.
BUILT TO LAST BUILT FOR YOU - Durable stainless steel connectors and leak-proof polypropylene reservoir guarantee long-term reliability.
CONSISTENT HYDRATION NO WAIT - Pre-pressurized 4-gallon tank delivers up to 3.2 gallons of purified water instantly, perfect for busy households.
FLEXIBLE INSTALLATION ZERO HASSLE - Engineered for both vertical and horizontal placement with included tank stand—fits seamlessly into any space.
GLOBALLY CERTIFIED TRUSTED WORLDWIDE - Individually pressure-tested and certified for safety and quality, making it a top choice for discerning professionals.

The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis storage tank designed for residential use. It holds up to 3.2 gallons of purified water and supports both vertical and horizontal installation. Constructed with food-grade, CE-certified materials and stainless steel connectors, it ensures safe, odor-free water storage. Pressure-tested for durability and reliability, this tank is ideal for average to large households seeking consistent, high-quality water supply.

Specifications

ASIN	B00LU28SHE
Best Sellers Rank	#5,054 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Undersink Water Filtration Replacement Parts
Brand Name	APEC WATER
Capacity	4 gallons
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (3,285)
Global Trade Identification Number	00854961005310
Included Components	TANK-4
Item Dimensions L x W x H	11"L x 11"W x 14.5"H
Item Type Name	Reverse Osmosis Tank
Item Weight	0.9 Kilograms
Manufacturer	APEC Water Systems
Manufacturer Part Number	TANK-4
Material Type	Stainless Steel
Model Number	TANK-4
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	certified frustration-free
UPC	854961005310
Unit Count	1.0 Count

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