--- product_id: 261832467 title: "Merrill MFG PRVNL50 1/2\" No-Lead Pressure Relief Valve, Brass" brand: "merrill" price: "132.22 DT" currency: TND in_stock: true reviews_count: 8 url: https://www.desertcart.tn/products/261832467-merrill-mfg-prvnl50-1-2-no-lead-pressure-relief-valve store_origin: TN region: Tunisia --- # 1/2" NPT threaded connections Lead-free brass with stainless steel springs 75 PSI pressure relief rating Merrill MFG PRVNL50 1/2" No-Lead Pressure Relief Valve, Brass **Brand:** merrill **Price:** 132.22 DT **Availability:** ✅ In Stock ## Summary > 🛠️ Protect your flow, elevate your system — pressure relief perfected. ## Quick Answers - **What is this?** Merrill MFG PRVNL50 1/2" No-Lead Pressure Relief Valve, Brass by merrill - **How much does it cost?** 132.22 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/261832467-merrill-mfg-prvnl50-1-2-no-lead-pressure-relief-valve) ## Best For - merrill enthusiasts ## Why This Product - Trusted merrill brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Legacy Brand:** From a family-owned leader since 1949, engineered for reliability. - • **Durable Lead-Free Brass:** Corrosion-resistant, eco-conscious materials built to last. - • **Precision Pressure Control:** Field adjustable relief at 75 PSI keeps your system safe and sound. - • **Universal 1/2" Threaded Fit:** Seamlessly integrates with standard cold water plumbing setups. - • **Certified Safety & Compliance:** IAMPO and NSF/ANSI 372 certified for peace of mind. ## Overview The Merrill MFG PRVNL50 is a 1/2" no-lead brass pressure relief valve designed for cold water systems, featuring a 75 PSI adjustable relief setting, durable corrosion-resistant construction, and certified safety compliance. Ideal for professional-grade plumbing installations seeking reliable pressure protection. ## Description 1/2 in. male NPT x 1/2 in. female FPT 1/2" Line Connection, relieves pressure at 75 PSI - Field Adjustable. Corrosion-resistant and solid no-lead brass construction is designed to relieve excessive pressure in the water system. Recommended for all cold water system installation. Founded in 1949, Merrill Manufacturing is a family-owned and operated manufacturer in Iowa. While maintaining our family values, Merrill is always changing to meet and exceed the demands of our loyal customers! Merrill Manufacturing is located on the shores of Storm Lake, Iowa and is a global leader in the water well industry. Merrill is widely recognized for its yard hydrants, offering over 3,500 products to meet your water well needs. In 1949, Noel Merrill Anderson founded Merrill Manufacturing Company with his invention of the AnyFlow Yard Hydrant. ## Features - Pressure relief valves are for protection against excessive pressure - 1/2 in. male NPT x 1/2 in. female FPT - Lead free brass with stainless steel control springs - IAMPO Certified - 1/2" Line Connection, 75 PSI - Not for use with water heaters - Cold water systems only - CALIFORNIA PROP 65 WARNING: Product may expose you to chemicals known to the State of California to cause cancer and reproductive harm. See P65Warnings.ca.gov for details ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B08GD12QV5 | | Best Sellers Rank | #27,937 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #8 in Relief Valves | | Brand Name | Merrill | | Connector Type | Threaded | | Customer Reviews | 4.6 4.6 out of 5 stars (205) 4.6 out of 5 stars | | Exterior Finish | Brass | | Inlet Connection Size | 0.5 inches | | Inlet Connection Type | National Pipe Tapered | | Manufacturer | Merrill Manufacturing Company | | Manufacturer Part Number | PRVNL50-A | | Material Type | Brass | | Maximum Pressure | 75 psi | | Model Number | PRVNL50-A | | Number Of Items | 1 | | Number Of Pieces | 1 | | Number Of Ports | 1 | | Outlet Connection Size | 0.5 inches | | Outlet Connection Type | MNPT | | Size | 1/2 inch | | Specification Met | IAMPO, NSF/ANSI 372, AB 1953 | | Thread Size | 1/2 inches | | Thread Type | National Pipe Thread | | Unit Count | 1 Count | | Upc | 642367450519 | | Valve Type | Pressure Relief Valve | ## Product Details - **Brand:** Merrill - **Exterior Finish:** Brass - **Inlet Connection Size:** 0.5 Inches - **Inlet Connection Type:** National Pipe Tapered - **Material:** Brass - **Maximum Operating Pressure:** 75 Pound per Square Inch - **Number of Ports:** 1 - **Outlet Connection Size:** 0.5 Inches - **Outlet Connection Type:** MNPT - **Specification Met:** IAMPO, NSF/ANSI 372, AB 1953 ## Images ![Merrill MFG PRVNL50 1/2" No-Lead Pressure Relief Valve, Brass - Image 1](https://m.media-amazon.com/images/I/314GOvz6pML.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Every home need one *by on Reviewed in the United States July 22, 2025* It marked as 75 psi but actually about 95 psi when it starts relief pressure. It does leak when I set my water pressure in pipe to be 80psi.I resolved that issue by opening the valve and turned the adjustment for about half turn clockwise. Now its starts to relief pressure about 100 psi and no longer leaks.It squeaks once when water hammer happens and leaks a few drops of water. This means it is very sensitive. I think it should be code required for every home. People are under a false sense of security of their home water pressure is under certain psi because they have a pressure regulator. The reality is if the pressure reducing valve leaks, which is very common, it will only need a little water to increase the in home water pressure. Although most pressure regulating valves are good quality but after a few years especially when you get some solids in the water, the seal will not be 100% water proof. In such case when you have a water pressure surge from the city on top of pressure surge caused by water hammer, you are likely to have a busted water pipe.This pressure relieve valve is the most reliable solution. I hope the spring will not break.I saw a lot of this kind of valve on Amazon under different brands but I believe they are all the same. I should have bought a cheaper ones to save few dollars. ### ⭐⭐⭐⭐⭐ Good item, fixed a leaking safety *by on Reviewed in the United States August 8, 2025* Does the job, easy install ### ⭐⭐⭐⭐⭐ Good product *by on Reviewed in the United States September 26, 2025* I wanted to add a pressure relief valve to my irrigation system after I had a sprinkler head lock up. I did test the relief pressure and it was about 70 psi. For the price, this is a great deal. ## Frequently Bought Together - Merrill MFG PRVNL50 1/2" No-Lead Pressure Relief Valve, Brass - MEASUREMAN 2-1/2" Dial Size, Glycerin Filled Pressure Gauge, 0-100psi/kpa, 304 Stainless Steel Case, 1/4" NPT Lower Mount - SENCTRL 100 Psi Lead-Free Glycerin Liquid Filled Low Pressure Gauge, 2.5" Dial Size, 1/4" NPT Lower Mount, Stainless Steel Case, for Home Potable Water Pump, Air, Well, RV Hose, Pressure Test --- ## 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.tn/products/261832467-merrill-mfg-prvnl50-1-2-no-lead-pressure-relief-valve](https://www.desertcart.tn/products/261832467-merrill-mfg-prvnl50-1-2-no-lead-pressure-relief-valve) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-15*