--- product_id: 310638346 title: "TWT173M 1.28 GPF Dual Flush In-Wall Toilet Tank Only with Copper Supply Line" brand: "toto" price: "¥263146" currency: JPY in_stock: true reviews_count: 1 url: https://www.desertcart.jp/products/310638346-twt173m-1-28-gpf-dual-flush-in-wall-toilet-tank store_origin: JP region: Japan --- # 1.28/0.9 GPF dual flush Copper supply line included In-wall tank design TWT173M 1.28 GPF Dual Flush In-Wall Toilet Tank Only with Copper Supply Line **Brand:** toto **Price:** ¥263146 **Availability:** ✅ In Stock ## Summary > 🚿 Flush Smarter, Live Greener — The Future of Bathroom Efficiency! ## Quick Answers - **What is this?** TWT173M 1.28 GPF Dual Flush In-Wall Toilet Tank Only with Copper Supply Line by toto - **How much does it cost?** ¥263146 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/310638346-twt173m-1-28-gpf-dual-flush-in-wall-toilet-tank) ## Best For - toto enthusiasts ## Why This Product - Trusted toto brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Upgrade:** Compatible with standard in-wall setups for a hassle-free, professional-grade bathroom refresh. - • **Eco-Smart Dual Flush:** Choose between 0.9 or 1.28 gallons per flush to slash water bills and boost sustainability. - • **Trusted Toto Quality:** Backed by a top-tier brand with a 4.1-star rating, combining reliability with cutting-edge plumbing tech. - • **Durable Copper Supply Line:** Premium corrosion-resistant copper piping ensures long-lasting, leak-free performance. - • **Sleek In-Wall Installation:** Maximize bathroom space with a discreet, wall-mounted tank system that blends seamlessly with modern interiors. ## Overview The Toto TWT173M is a high-efficiency in-wall toilet tank featuring a dual flush system with 0.9 and 1.28 gallons per flush options, designed to conserve water without sacrificing performance. It includes a durable copper supply line for reliable installation and is crafted by Toto, a trusted leader in plumbing fixtures. ## Description IN WALL TANK SYSTEM W/ COPPER PIPE - 1.28GPF & .9GPF FOR CCT ## Features - Dual-Max flush promotes water conservation with a 0.9 or 1.28 GPF option ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B084KQYNQY | | Best Sellers Rank | #309,138 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #31 in Toilet Water Tanks | | Brand Name | TOTO | | Customer Reviews | 4.1 4.1 out of 5 stars (10) 4.1 out of 5 stars | | Included Components | Product Only | | Installation Method | wall | | Item Type Name | Toilets and Bidets | | Item Weight | 43 pounds | | Manufacturer | TOTO | | Manufacturer Part Number | WT173M | | Material Type | Plastic | | Model Number | WT173M | | Number Of Items | 1 | | Seat Material | Plastic | | Unit Count | 1 Count | | Upc | 739268348677 | ## Product Details - **Brand:** TOTO - **Installation Type:** wall - **Item Weight:** 43 Pounds - **Material:** Plastic - **Seat Material Type:** Plastic ## Images ![TWT173M 1.28 GPF Dual Flush In-Wall Toilet Tank Only with Copper Supply Line - Image 1](https://m.media-amazon.com/images/I/61zGwO5etzL.jpg) ## Customer Reviews ### ⭐ Buyer Beware! *by on Reviewed in the United States January 24, 2025* I have a toto in-wall carrier and wanted to add atoto washlet. Lots of issues!1. No where in the instructions, for the washer or the tank does it tell you that you need their PROPRIETARY shut-off valve. After the plumbers messed around with it for several hours and a couple of trips to a specialty plumbing store with no luck, I called toto and was told of the mystery, necessary part.2. Poor customer service as the rep was very condescending and making excuses for why it isn't in the kit or instructios.3. The PROPRIETARY chrome shut-off valve in question is $160.00! Yes, because charging 3 times what everyone else charges for these systems isn't enough. There is absolutely no reason, other than to rip you off, does this part need to be proprietary. ## Frequently Bought Together - Toto TWT173M 1.28 GPF Dual Flush In-Wall Toilet Tank Only with Copper Supply Line - TOTO CT426CFG#01 Toilets, Cotton White - TOTO YT920#WH Toilets and Bidets, White Matte --- ## 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.jp/products/310638346-twt173m-1-28-gpf-dual-flush-in-wall-toilet-tank](https://www.desertcart.jp/products/310638346-twt173m-1-28-gpf-dual-flush-in-wall-toilet-tank) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-02*