--- product_id: 256163481 title: "Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank" brand: "apec water" price: "$199.98" currency: USD in_stock: true reviews_count: 6 category: "Apec Water" url: https://www.desertcart.us/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis store_origin: US region: United States of America --- # 4 Gallon pre-pressurized capacity Vertical & horizontal discharge Food-grade bladder, certified safe Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank **Brand:** apec water **Price:** $199.98 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead with pure water on demand — because your health deserves no compromises! ## 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?** $199.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 - • **Pure & Safe Every Time:** Food-grade bladder and stainless steel connectors ensure leak-free, odorless water with certified global safety standards. - • **Authenticity Guaranteed:** Purchase only from authorized sellers to secure genuine APEC quality and avoid counterfeit risks. - • **Built to Last, Built for You:** Durable metal construction with airtight polypropylene and butyl reservoirs guarantees long-term reliability and peace of mind. - • **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 a sturdy tank stand, fitting seamlessly into any under-sink setup. ## Overview The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis storage tank designed for residential use. It efficiently holds up to 3.2 gallons of purified water and supports both vertical and horizontal installation. Featuring a food-grade bladder, stainless steel connectors, and certified materials, it ensures safe, odor-free, and leak-proof water storage. Ideal for average to large families, this durable tank is pressure-tested and globally certified for quality and safety. ## 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: ممتاز 💯💯💯💯💯 Review: Works OK 2 weeks in ## 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 | | ASIN | B00LU28SHE | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #71,115 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #173 in Under-Sink Water Filters | | Color | White | | Customer Reviews | 4.5 4.5 out of 5 stars (11,101) | | Customer reviews | 4.5 4.5 out of 5 stars (11,101) | | Date First Available | 20 April 2015 | | Date First Available | 20 April 2015 | | Included components | TANK-4 | | Installation Method | Under Sink | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Item Weight | 900 g | | Item model number | TANK-4 | | Item model number | TANK-4 | | Manufacturer | APEC Water Systems | | Manufacturer | APEC Water Systems | | Material | Stainless Steel | | Part number | TANK-4 | | Pattern | Tank | | Power source type | Manual (No Power Source Required) | | Product Dimensions | 27.94 x 27.94 x 36.83 cm; 900 g | | Product Dimensions | 27.94 x 27.94 x 36.83 cm; 900 g | | Size | 4 Gallon | | Special Features | Heavy Duty | | Specification met | certified frustration-free | | Style | TANK-4 | ## 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/71yb+3-D5lL.jpg) ## 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 ### ⭐⭐⭐⭐⭐ Review *by U***E on 2 July 2025* ممتاز 💯💯💯💯💯 ### ⭐⭐⭐⭐⭐ Review *by 7***R on 19 October 2025* Works OK 2 weeks in ### ⭐⭐⭐⭐⭐ Review *by B***H on 30 March 2017* The tap water we use at home had a strange smell.our home is 10 years old. My wife wasnt comformtable using it for drinking or cooking even after it goes through a regular filter. I bought the APEC ROES-50 system after much research. Both me and my wife are completely completely satisfied with this purchase. Water tatses awsome now after installing Apec RO and and there is no stink in the water either. Qyality at the Price: I had veen putting off buying an RO previously due to the cost involved with other systems. But Im gappy to report that Apec RO system delivers quality at a reasonable price. Installation: I also worried about the installation. But it was an easy DIY. Took me about 2 hours to complete. There are plenty of vidoes online and the instruction manual is detailed enough. The storage tank holds enough water for 3 adults through out the day. I could not hear any operating noise tha few people noted. The drain noise that some people noted can also be avoided if you follow the intructions properly . It fits under our kitchen sink faucet cabinet and neatly tucked away. I did not have to drill any holes in the counter top. I just replaced the spray hose with the RO faucet. Delivery and packaging: The product arrived in 3 days and packaging was good. No damage on delivery. The included faucet looks good and feels solid enough. Although it works on water pressure (not electricity), I found the stream of water to be ok and not weak. Water PPM: I tested the water from the RO and the equipment showed 6 ppm which is great and clean. Exactly what I expected out of the system. I would definitely recommend this system ## 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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis](https://www.desertcart.us/products/256163481-systems-tank-4-4-gallon-residential-pre-pressurized-reverse-osmosis) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-20*