--- product_id: 346839334 title: "LFN45B Series 3/4\" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, Double Union Solder Inlet and Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi" brand: "watts" price: "257608CFA" currency: XOF in_stock: true reviews_count: 13 category: "Watts" url: https://www.desertcart.sn/products/346839334-lfn45b-series-3-4-lead-free-cast-copper-silicon-alloy store_origin: SN region: Senegal --- # Lead-free, protects plumbing & reduces water waste Double union solder inlet/outlet for easy install Adjustable 25-75 psi pressure range LFN45B Series 3/4" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, Double Union Solder Inlet and Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi **Brand:** watts **Price:** 257608CFA **Availability:** βœ… In Stock ## Summary > πŸ’§ Control your flow, protect your home β€” pressure perfected. ## Quick Answers - **What is this?** LFN45B Series 3/4" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, Double Union Solder Inlet and Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi by watts - **How much does it cost?** 257608CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/346839334-lfn45b-series-3-4-lead-free-cast-copper-silicon-alloy) ## 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€’ **Built to Last & Lead-Free:** Crafted from lead-free copper silicon alloy with stainless steel strainer for durability and safe water quality. - β€’ **Precision Pressure Control:** Easily dial in optimal water pressure from 25 to 75 psi to safeguard your plumbing and boost efficiency. - β€’ **Thermal Expansion Protection:** Integrated bypass prevents pressure spikes caused by temperature changes, extending system lifespan. - β€’ **Versatile High-Pressure Handling:** Operates reliably up to 400 psi max, perfect for commercial, industrial, and upscale residential setups. - β€’ **Effortless Installation & Maintenance:** Double union solder connections streamline setup and in-line servicingβ€”no plumber-level hassle required. ## Overview The Watts LFN45B Series 3/4" Lead-Free Water Pressure Reducing Valve offers adjustable pressure control from 25 to 75 psi with a max capacity of 400 psi. Featuring a durable lead-free copper silicon alloy body, double union solder inlet/outlet for easy installation, and a stainless steel strainer, it safeguards plumbing systems while reducing water consumption. Its thermal expansion bypass protects against pressure surges, making it ideal for commercial, industrial, and residential use. ## Description This 3/4 inch water pressure reducing valve is designed to reduce incoming water pressure to protect plumbing systems and reduce water consumption for commercial, industrial and residential applications. The easy maintenance assembly consists of a lead free brass body construction, double union solder inlet and outlet connection, stainless steel integral strainer, thermoplastic seat module, thermal expansion bypass and a sealed spring cage for waterworks pit installations. The temperature range is 33 to 180 degrees F (0.5 to 82 degrees C). Suitable for up to 400 psi (27.6 bar), the pressure range can be adjusted from 25 to 75 psi (172 to 517 kPa) with the standard setting at 50 psi (345 kPa). Review: Works great - Like it, was easy to install, works great, easy to adjust. Valve was just as described and preset to 50 psi. Review: Perfect replacement for 1” Watts N35B U - I purchased the 1” Watts LFN45BM1-U to replace my 30 year old Watts N35B. It is the exact same length. This came with two O rings, and a flange. The flange has 1” female threads. A second flange can be purchased depending on the configuration needed. The unit also has 1” female threads on both the inlet and outlet. My original installation used a flange on the inlet and threads on the outlet. The price was right and desertcart delivered it the next morning! Installation tips: If your replacing an older PRV where you have a flange on one end and threaded on the other end, you may have difficulty getting enough clearance to unthread, remove and replace the PRV. Mine was installed on a very short section of 1” copper pipe. It came up through my garage floor through a shutoff and the PRV and then went to an elbow. To get enough room I used a board and a handcut wedge and hammer to carefully prop up the pipe at the elbow to gain enough room. I screwed one end on and then carefully insert one of the O rings before tightening up the flange. For some reason Teflon tape failed to seal twice, I ended up using pipe dope. The symptom that lead to the replacement was a sudden spike in pressure when turning on a tap after having heated hot water. I reasoned that I needed an expansion tank, as per code for a closed system. My house built in 1994 never had one. After installing the expansion tank properly I was getting an extended amount of high pressure. When I installed the expansion tank I measured the water pressure to be 60 psi. Purchased a new maximum reading pressure gauge for my hose bib and discovered the pressure would slowly creep up to 82 psi or 94 psi if the expansion tank valve was closed. Isolating the hot water heater also showed sharp increases in pressure. With a faucet running the old PRV would maintain around 50 psi but would slowly build by its own (pressure creep). The new valve is supposed to be set at the factory for 50 psi, but seems to actually be providing 55 psi. Worked great, didn’t bother to change it. If this new PRV fails early I will update my review ## Features - LEAD-FREE WATER PRESSURE REDUCTION: The Watts 3/4" Lead-Free Water Pressure Reducing Valve reduces incoming water pressure to protect plumbing systems and reduce water consumption in commercial, industrial, and residential applications. This assembly includes a removable integral stainless steel strainer, thermoplastic seat module, thermal expansion bypass, and a sealed spring case for waterwork pit installations. - EASY INSTALLATION AND MAINTENANCE: This lead-free water pressure reducing valve is designed for straightforward installation with easy handling and in-line serviceability, featuring double union solder inlet and outlet connections that simplify the installation process. - THERMAL EXPANSION PROTECTION: The valve includes a bypass feature that effectively controls thermal expansion pressure, preventing potential damage to the plumbing system. It has an operating temperature range of 33Β° F (0.5Β° C) to 180Β° F (0.5Β° C). - VERSATILE PRESSURE ADJUSTMENT: This valve is suitable for pressures up to 400 psi (27.6 bar) and allows for an adjustable pressure range between 25 to 75 psi (172 to 517 kPa), with a standard setting at 50 psi (345 kPa). - EVERY DROP COUNTS: Water. It's in our name and close to our hearts. Since 1874, Watts Water Technologies has been delivering innovative technologies that make the world's most precious resource safe and accessible. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. Our family of brands offers one of the most varied product lines in the world, with world-class, water-related solutions. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00LO3F30O | | Best Sellers Rank | #31,999 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #82 in Relief Valves | | Brand Name | Watts | | Connector Type | Union | | Customer Reviews | 4.5 4.5 out of 5 stars (525) | | Exterior Finish | Stainless Steel | | Global Trade Identification Number | 00098268332469 | | Included Components | Valve | | Inlet Connection Size | 0.75 Inches | | Inlet Connection Type | Solder | | Item Dimensions | 2.44 x 5.63 x 7.38 inches | | Item Type Name | Lead Free, Water Pressure Reducing Valve | | Item Weight | 2.1 Pounds | | Manufacturer | Watts | | Material Type | Stainless Steel,Lead | | Maximum Pressure | 300 Pound per Square Inch | | Model Number | LFN45BM1-DU-S | | Number of Ports | 2 | | Outlet Connection Size | 0.75 Inches | | Outlet Connection Type | Union Joint | | Size | 3/4 Inch | | Specification Met | NSF/ANSI 61 | | UPC | 098268332469 | | Unit Count | 1.0 Count | | Valve Type | water pressure reducing valve | ## Product Details - **Brand:** Watts - **Exterior Finish:** Stainless Steel - **Inlet Connection Size:** 0.75 Inches - **Inlet Connection Type:** Solder - **Item dimensions L x W x H:** 2.44 x 5.63 x 7.38 inches - **Material:** Stainless Steel,Lead - **Maximum Operating Pressure:** 300 Pound per Square Inch - **Number of Ports:** 2 - **Outlet Connection Size:** 0.75 Inches - **Outlet Connection Type:** Union Joint ## Images ![LFN45B Series 3/4" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, Double Union Solder Inlet and Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi - Image 1](https://m.media-amazon.com/images/I/712y4+bpIjL.jpg) ## Available Options This product comes in different **Color, Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great *by R***J on February 9, 2026* Like it, was easy to install, works great, easy to adjust. Valve was just as described and preset to 50 psi. ### ⭐⭐⭐⭐⭐ Perfect replacement for 1” Watts N35B U *by S***L on April 15, 2024* I purchased the 1” Watts LFN45BM1-U to replace my 30 year old Watts N35B. It is the exact same length. This came with two O rings, and a flange. The flange has 1” female threads. A second flange can be purchased depending on the configuration needed. The unit also has 1” female threads on both the inlet and outlet. My original installation used a flange on the inlet and threads on the outlet. The price was right and Amazon delivered it the next morning! Installation tips: If your replacing an older PRV where you have a flange on one end and threaded on the other end, you may have difficulty getting enough clearance to unthread, remove and replace the PRV. Mine was installed on a very short section of 1” copper pipe. It came up through my garage floor through a shutoff and the PRV and then went to an elbow. To get enough room I used a board and a handcut wedge and hammer to carefully prop up the pipe at the elbow to gain enough room. I screwed one end on and then carefully insert one of the O rings before tightening up the flange. For some reason Teflon tape failed to seal twice, I ended up using pipe dope. The symptom that lead to the replacement was a sudden spike in pressure when turning on a tap after having heated hot water. I reasoned that I needed an expansion tank, as per code for a closed system. My house built in 1994 never had one. After installing the expansion tank properly I was getting an extended amount of high pressure. When I installed the expansion tank I measured the water pressure to be 60 psi. Purchased a new maximum reading pressure gauge for my hose bib and discovered the pressure would slowly creep up to 82 psi or 94 psi if the expansion tank valve was closed. Isolating the hot water heater also showed sharp increases in pressure. With a faucet running the old PRV would maintain around 50 psi but would slowly build by its own (pressure creep). The new valve is supposed to be set at the factory for 50 psi, but seems to actually be providing 55 psi. Worked great, didn’t bother to change it. If this new PRV fails early I will update my review ### ⭐⭐⭐⭐⭐ Direct replacement for older Watts regulator. *by J***R on September 8, 2025* Got this to replace a 20 year old Watts regulator. It was a direct replacement and worked with the old nuts. Only came with one nut and would be better if it was new install, but I did not need it. Good price and works great! ## Frequently Bought Together - Watts LFN45B Series 3/4" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, Double Union Solder Inlet and Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi - MEASUREMAN 0-200 PSI Water Pressure Gauge, 2-1/2'' Dial, Hose bib Pressure Gauge, Home Water Pressure Tester, Durable 3/4” Hose Thread, Water Pressure Gauge for Home --- ## 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.sn/products/346839334-lfn45b-series-3-4-lead-free-cast-copper-silicon-alloy](https://www.desertcart.sn/products/346839334-lfn45b-series-3-4-lead-free-cast-copper-silicon-alloy) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-07-24*