--- product_id: 24321116 title: "LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm" brand: "watts" price: "Β₯43440" currency: JPY in_stock: true reviews_count: 8 category: "Watts" url: https://www.desertcart.jp/products/24321116-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic-mixing store_origin: JP region: Japan --- # Locking temp adjustment 13 GPM flow rate 150 PSI max pressure LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm **Brand:** watts **Price:** Β₯43440 **Availability:** βœ… In Stock ## Summary > πŸ”₯ Lock in your perfect temp, every time! πŸ”’ ## Quick Answers - **What is this?** LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm by watts - **How much does it cost?** Β₯43440 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/24321116-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic-mixing) ## Best For - watts enthusiasts ## Why This Product - Trusted watts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Certified Reliability:** ASSE 1070, 1069, 1017 and UPC listed for trusted compliance in residential and commercial environments. - β€’ **Secure Locking Mechanism:** Temperature settings lock in place to prevent accidental changesβ€”peace of mind for busy professionals. - β€’ **Universal Threaded Union:** Easy installation and maintenance with standard 3/4" threaded connections, perfect for any modern setup. - β€’ **Precision Thermal Control:** Solid wax hydraulic thermostat ensures exact temperature regulation for ultimate comfort and safety. - β€’ **Lead-Free Copper Silicon Alloy:** Eco-conscious, durable construction that meets strict health standards without compromising performance. ## Overview The Watts LFMMV-M1-UT is a 3/4" lead-free thermostatic mixing valve crafted from copper silicon alloy, delivering up to 13 gallons per minute with precise temperature control between 80-120Β°F. Featuring a locking adjustment cap, integral filter washers, and check valves, it supports pressures up to 150 PSI and meets multiple ASSE certifications, making it a reliable, eco-friendly choice for residential and commercial plumbing. ## Description This 3/4" lead free thermostatic mixing valve is designed for residential, commercial or institutional environments for supplying baths or lavatories with tempered water. The double throttling design controls both hot and cold water supply to the mixed outlet. It consists of a lead free brass body, threaded union connections, solid wax hydraulic principle thermostat, integral filter washers and check valves with a locking mechanism for the temperature setting. The adjustable field range temperature at mixed outlet is 80 to 120 degrees F (27 to 49 degrees C). The maximum pressure rating is 150 PSI (10.3 BAR). Watts 0559119 Features: Lead free brass construction Thermal actuation technology for precise temperature control Locking mechanism secures temperature setting ASSE 1070, ASSE 1069, ASSE 1017 and UPC listed Review: Nice quality mixer valve, easy for me, a DIY'r to install. - Easy to install in my bath vanity floor. This anti-scald (mixer) valve for controlling hot water temperature at my Roman tub replaces a 2007 year mixer valve. Read the directions carefully; to adjust the temperature, unscrew the Allen-head screw in the tan handle a bit (no need to remove) and then pull the handle back and turn. The handle cannot be turned with the Allen-head screw tight, and there was no need to completely remove the screw. Build quality: High quality part, greatly improved for long-term reliability, & ability to adjust the temperature at the tub. Old part replaced, from 2007. Review: Easy to install if you have the same valve installed already. - My house was not getting hot water from my gas water heater and my hot water line was hot, so i knew it was not my water heater. After the mixing valve the water line was cool to the touch. So I replaced my old 10 year mixing valve with the same one which took me 30 minutes to change out and happy to report that there is hot water again. ## Features - Thermostat controls both hot and cold water - Adjustment cap with locking feature - Integral filter washers and check valves - Asse Listed 1070,1069, 1017 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B007VHHENG | | Best Sellers Rank | #260,222 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #333 in Faucet Valves | | Brand | Watts | | Brand Name | Watts | | Connector Type | Threaded | | Customer Reviews | 4.5 out of 5 stars 89 Reviews | | Exterior Finish | Copper | | Inlet Connection Size | 0.75 inches | | Inlet Connection Type | threaded | | Item Dimensions | 6.3 x 4.5 x 2.6 inches | | Item Weight | 2.2 pounds | | Item dimensions L x W x H | 6.3 x 4.5 x 2.6 inches | | Manufacturer | WATTS | | Manufacturer Part Number | LFMMVM1-UT | | Material | Lead Free Copper Silicon Alloy | | Material Type | Lead Free Copper Silicon Alloy | | Maximum Pressure | 150 psi | | Model Number | LFMMV-M1-UT | | Number of Items | 1 | | Number of Packs | 1 | | Number of Ports | 1 | | Outlet Connection Size | 4.5 inches | | Outlet Connection Type | Threaded | | Size | 4.5 inches x 6.3 inches x 2.6 inches | | Thread Size | 4.5 inches | | Thread Type | Threaded | | UPC | 098268451825 | | Unit Count | 1 Count | | Valve Type | Thermostatic Mixing Valve | ## Product Details - **Brand:** Watts - **Exterior Finish:** Copper - **Inlet Connection Size:** 0.75 inches - **Inlet Connection Type:** threaded - **Item dimensions L x W x H:** 6.3 x 4.5 x 2.6 inches - **Material:** Lead Free Copper Silicon Alloy - **Maximum Operating Pressure:** 150 psi - **Number of Ports:** 1 - **Outlet Connection Size:** 4.5 inches - **Outlet Connection Type:** Threaded ## Images ![LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm - Image 1](https://m.media-amazon.com/images/I/61GVKmOuMGL.jpg) ## Questions & Answers **Q: What is the min./max. Pressure for both inlets? And is there a drop in outlet pressure?** A: 30-150 psi operating pressure. Negligible pressure drop. **Q: What is the min./max. hot water temp. inlet? and how it will work if the hot temp. drop below the min.?** A: Min/Max HW inlet temp= 120 to 180 degrees. If the HW inlet water temp is below 120 the valve will simply pass cold water. The max pressure for both inlets is 150 PSI. There is no listed minimum pressure. Pressure drop varies with flow- at 6 GPM flow the pressure drop is 10 PSI. **Q: My solar hot water will be feeding my electric tankless heater. This should drop the water from 180 to 120 degree before tankless heater right?** A: Yes- but a couple of cautions. The maximum outlet temperature setting is 120 degrees, and the maximum inlet hot water temp to get that 120 degrees is 180 degrees. The valve is rated to still function at 200 degree inlet temp but at anything over 180 you will likely end up with an outlet temp over 120. **Q: The temperature adjustment knob will not turn. Is there a lock or trick to this?** A: To adjust the setting of the valve, loosen locking cap screw with hex wrench, see Figure 3. Cap must be lifted 1/4" to adjust temperature. To increase the temperature, turn counterclockwise. To decrease temperature turn clockwise. 4. Lower handle and tighten screw. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nice quality mixer valve, easy for me, a DIY'r to install. *by N***M on June 24, 2025* Easy to install in my bath vanity floor. This anti-scald (mixer) valve for controlling hot water temperature at my Roman tub replaces a 2007 year mixer valve. Read the directions carefully; to adjust the temperature, unscrew the Allen-head screw in the tan handle a bit (no need to remove) and then pull the handle back and turn. The handle cannot be turned with the Allen-head screw tight, and there was no need to completely remove the screw. Build quality: High quality part, greatly improved for long-term reliability, & ability to adjust the temperature at the tub. Old part replaced, from 2007. ### ⭐⭐⭐⭐⭐ Easy to install if you have the same valve installed already. *by J***L on April 18, 2025* My house was not getting hot water from my gas water heater and my hot water line was hot, so i knew it was not my water heater. After the mixing valve the water line was cool to the touch. So I replaced my old 10 year mixing valve with the same one which took me 30 minutes to change out and happy to report that there is hot water again. ### ⭐⭐⭐⭐⭐ Works Great Easy Install *by D***. on June 9, 2017* Installed in my electrical storage heating system along with a 115 Gal Westinghouse water heater. I can now keep 140 Deg water in the tank and dispense at anywhere from 80 deg to 120Deg F. Now full hot tap water is not dangerously hot and we never run out of hot water. Install was easy with the addition of 3 male NPT sweat on fittings. ## Frequently Bought Together - Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm - MEASUREMAN Tridicator, Thermo-Manometer Pressure Gauge, 2-1/2", 0-160psi/30-250 deg F, Stainless Steel Case, 1/4" NPT Back Mount - MEANLIN Stainless Steel Thermal Pressure Gauge 0-160Psi, 30-250F, 2.5" Face Dial, Liquid Filled, 1/4" NPT, Back Mount --- ## 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/24321116-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic-mixing](https://www.desertcart.jp/products/24321116-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic-mixing) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-08*