--- product_id: 11011230 title: "APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank" brand: "apec water" price: "$320.69" currency: USD in_stock: true reviews_count: 13 category: "Apec Water" url: https://www.desertcart.us/products/11011230-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized store_origin: US region: United States of America --- # 4 Gallon capacity Pre-pressurized for instant flow Food-grade, certified bladder APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank **Brand:** apec water **Price:** $320.69 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your RO system with premium pressure and pure performance! ## Quick Answers - **What is this?** APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank by apec water - **How much does it cost?** $320.69 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/11011230-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized) ## 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 - • **Safe & Durable:** Food-grade bladder and stainless steel connectors guarantee leak-free, odorless water storage. - • **Versatile Installation:** Works efficiently in both vertical and horizontal positions with included tank stand. - • **Maximize Your Hydration:** 4-gallon capacity holds up to 3.2 gallons of purified water, perfect for busy households. - • **Certified Quality Assurance:** Individually pressure-tested and CE approved for global safety and durability standards. - • **Pressure-Perfect Performance:** Pre-pressurized design ensures fast, consistent water flow without waiting. ## Overview The APEC Water Systems Tank-4 is a 4-gallon pre-pressurized reverse osmosis storage tank designed for residential use. Featuring a food-grade bladder and stainless steel construction, it delivers up to 3.2 gallons of purified water with fast flow rates. Certified for safety and durability, it supports versatile installation and ensures leak-free, odorless water storage, making it an industry-standard upgrade for RO systems. ## Description Our standard ro water tanks offer quality water storage for use with most residential Reverse osmosis systems. Built with stainless steel construction, these durable 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) ## 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 | | Brand | APEC WATER | | Brand Name | APEC WATER | | Capacity | 4 Gallons | | Color | White | | Customer Reviews | 4.6 out of 5 stars 3,258 Reviews | | 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 | Stainless Steel | | Material Type | Stainless Steel | | Model Number | TANK-4 | | Product Dimensions | 11"L x 11"W x 14.5"H | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | certified frustration-free | | UPC | 854961005310 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** APEC WATER - **Capacity:** 4 Gallons - **Included Components:** TANK-4 - **Installation Type:** Under Sink - **Item Weight:** 0.9 Kilograms - **Material:** Stainless Steel - **Package Information:** Tank - **Product Dimensions:** 11"L x 11"W x 14.5"H - **Purification Method:** Reverse Osmosis - **Special Feature:** Heavy Duty ## Images ![APEC Water 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) ## Available Options This product comes in different **Size** 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 ### ⭐⭐⭐⭐⭐ Review *by C***R on December 3, 2024* ### ⭐⭐⭐⭐⭐ Review *by X***O on March 22, 2026* ### ⭐⭐⭐⭐⭐ Review *by A***R on December 6, 2025* ## 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/11011230-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized](https://www.desertcart.us/products/11011230-apec-water-systems-tank-4-4-gallon-residential-pre-pressurized) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-10*