--- product_id: 256163481 title: "Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank" brand: "apec water" price: "Β₯58063" currency: JPY in_stock: true reviews_count: 6 category: "Apec Water" url: https://www.desertcart.jp/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis store_origin: JP region: Japan --- # 4 gal pre-pressurized capacity vertical/horizontal discharge food-grade, certified bladder Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank **Brand:** apec water **Price:** Β₯58063 **Availability:** βœ… In Stock ## Summary > πŸ’§ Elevate your hydration game with the RO tank that keeps pace with your lifestyle! ## Quick Answers - **What is this?** Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank by apec water - **How much does it cost?** Β₯58063 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis) ## Best For - apec water enthusiasts ## Why This Product - Trusted apec water brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Premium Safety & Durability:** Food-grade bladder and CE-certified materials ensure leak-proof, odor-free water storage you can trust. - β€’ **Seamless System Integration:** 1/4 inch male pipe thread inlet/outlet designed specifically for reverse osmosis systems for effortless connectivity. - β€’ **Consistent Hydration, No Wait:** Pre-pressurized 4-gallon tank delivers up to 3.2 gallons of purified water instantly, perfect for busy households. - β€’ **Flexible Installation, Zero Hassle:** Engineered for both vertical and horizontal placement with included tank standβ€”fits seamlessly into any under-sink setup. - β€’ **Trusted by Thousands, Rated 4.6⭐:** Join over 2,400 satisfied users who upgraded their water quality and flow with this industry-standard tank. ## Overview The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis water storage tank designed for residential use. It efficiently holds up to 3.2 gallons of purified water and supports both vertical and horizontal installation. Constructed with a food-grade bladder and certified materials, it guarantees safe, odor-free, and leak-proof water storage. Featuring stainless steel connectors and a 1/4 inch male pipe thread inlet/outlet, it integrates seamlessly with most RO systems. Highly rated by thousands, this durable tank is ideal for average to large families seeking reliable, high-volume purified water on demand. ## Description Our standard ro water tanks offer quality water storage for use with most residential reverse osmosis systems. These durable metal tanks will deliver a continuous and stable Supply of purified water at a fast flow rate with high volume suitable for average to large size families. Supported by fully enclosed polypropylene and butyl reservoirs, these storage tanks provide airtight protection against leaks. Their stainless steel connectors ensure leach-free integrity while post-cured diaphragms eliminate the possibility of odors from the tank. Individually pressure-tested for safety, all our tanks are certified and ce approved for materials quality, safety, and durability making them suitable for use anywhere in the world. Specifications: dimensions: 11 inch D x 15 inch h weight: 10 lbs. Optional tank ball valve: 1/4 inch connection to 1/4 inch or 3/8 inch tube size (not included with the tank) apec water does not distribute or sell our products to any 3RD party sellers on desertcart. Please purchase genuine apec water products from desertcart or apec water directly for authenticity. Review: 10 - Ω…Ω…ΨͺΨ§Ψ² πŸ’―πŸ’―πŸ’―πŸ’―πŸ’― Review: So far, so good! - I bought this to replace the stock tank for my RO system from GE. The old tank was barely putting out two cups of water at a time. However, the stock replacement was going to be around $150, so I was looking for a cheaper option. Since this tank is carried by the same store that I bought the RO system from, and they have it labeled as an "industry standard" in terms of pressure settings, I decided to give it a try. And so far, it works great! Much better pressure, and I get a lot more water out of the system at a time. Notably too, the water tastes better! Maybe because it's not mixing with old, stagnant water that can't be expelled. Super easy to install! Bought a shut off valve fitting to connect the tank to the plastic line of my system, and managed to connect it easily. Be sure to use plumbers tape on the fitting. I also used an O-ring for good measure. So far, no issues with leaking, as other people are reporting in their reviews. ## Features - Pre-pressurized 4 gallon water storage tank (holds up to 3.2 gallon of water) - Discharge efficiently in a vertical or horizontal position with tank stand - Food grade bladder and certified to ensure quality, safety and durability - Inlet/outlet connection: 1/4 inch male pipe thread. Special designed for ro application ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00LU28SHE | | Best Sellers Rank | #69,095 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #162 in Under-Sink Water Filters | | Brand | APEC WATER | | Brand Name | APEC WATER | | Capacity | 4 gallons | | Container Type | Dispenser | | Customer Reviews | 4.6 out of 5 stars 2,416 Reviews | | Global Trade Identification Number | 00854961005310 | | Included Components | Memory, tank stand | | Included components | Memory, tank stand | | Installation Type | Under Sink | | Item Dimensions L x W x H | 27.9L x 27.9W x 36.8H centimeters | | Item Type Name | Reverse Osmosis Tank | | Item Weight | 0.9 Kilograms | | Manufacturer | APEC Water Systems | | Material | Stainless Steel | | Material Type | Stainless Steel | | Model Name | TANK-4 | | Model Number | TANK-4 | | Number of Items | 1 | | Number of Packs | 1 | | Other Special Features of the Product | Heavy Duty | | Part Number | TANK-4 | | Power Source | Manual (No Power Source Required) | | Product dimensions | 27.9L x 27.9W x 36.8H centimeters | | Purification Method | Reverse Osmosis | | Special features | Heavy Duty | | Supported Water TDS Level Maximum (PPM) | 500 | | UPC | 854961005310 | | Unit Count | 1 Count | ## Product Details - **Brand:** APEC WATER - **Capacity:** 4 Gallons - **Material:** Stainless Steel - **Product dimensions:** 27.9L x 27.9W x 36.8H centimeters - **Special features:** Heavy Duty ## Images ![Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank - Image 1](https://m.media-amazon.com/images/I/61qErEepoSL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: What is the recommended pressure for this expansion tank?** A: They come pressurized from the manufacturer with a required 4-6 psi. **Q: What is the size of the male threaded fitting on the top? 3/8"?** A: 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" **Q: What is the recommended pressure for this expansion tank?** A: 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. **Q: I need replacement tank for my Ecowater ero335. Is this a comparable model. The company here says everything out there is plastic.** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 10 *by U***E on 2 July 2025* Ω…Ω…ΨͺΨ§Ψ² πŸ’―πŸ’―πŸ’―πŸ’―πŸ’― ### ⭐⭐⭐⭐⭐ So far, so good! *by C***R on 3 December 2024* I bought this to replace the stock tank for my RO system from GE. The old tank was barely putting out two cups of water at a time. However, the stock replacement was going to be around $150, so I was looking for a cheaper option. Since this tank is carried by the same store that I bought the RO system from, and they have it labeled as an "industry standard" in terms of pressure settings, I decided to give it a try. And so far, it works great! Much better pressure, and I get a lot more water out of the system at a time. Notably too, the water tastes better! Maybe because it's not mixing with old, stagnant water that can't be expelled. Super easy to install! Bought a shut off valve fitting to connect the tank to the plastic line of my system, and managed to connect it easily. Be sure to use plumbers tape on the fitting. I also used an O-ring for good measure. So far, no issues with leaking, as other people are reporting in their reviews. ### ⭐⭐⭐⭐⭐ APEC Fresh Water Holding Tank Performs Excellent Daily ! *by R***E on 23 July 2026* Excellent product and always functions perfectly! Thank you! ## Frequently Bought Together - APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank - Metpure Quick Connect Tank Ball Valve with Gasket For Water Purification Systems And Reverse Osmosis System Pressurized Water Storage Tank (1/4" Female NPT x 3/8" OD Quick Connect) - John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis](https://www.desertcart.jp/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-10*