---
product_id: 261832467
title: "Merrill MFG PRVNL50 1/2\" Pressure Relief Valve, Brass"
brand: "merrill"
price: "AR$66064"
currency: ARS
in_stock: true
reviews_count: 8
category: "Merrill"
url: https://www.desertcart.com.ar/products/261832467-merrill-mfg-prvnl50-1-2-pressure-relief-valve-brass
store_origin: AR
region: Argentina
---

# 1/2" NPT threaded connections 75 PSI max pressure Lead-free brass & stainless steel springs Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass

**Brand:** merrill
**Price:** AR$66064
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your plumbing game with precision and peace of mind!

## Quick Answers

- **What is this?** Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass by merrill
- **How much does it cost?** AR$66064 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/261832467-merrill-mfg-prvnl50-1-2-pressure-relief-valve-brass)

## 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

- • **Durable Brass Construction:** Robust lead-free brass body paired with stainless steel springs for long-lasting reliability.
- • **Precision Pressure Control:** Engineered to safely relieve pressure up to 75 PSI, protecting your system from costly damage.
- • **Cold Water System Optimized:** Specifically designed for cold water applications—perfect for modern, efficient plumbing solutions.
- • **Universal 1/2" Threaded Fit:** Seamlessly integrates with standard plumbing setups via male NPT and female FPT connections.
- • **Certified Safety & Compliance:** IAMPO and NSF/ANSI 372 certified, ensuring lead-free, eco-conscious performance.

## Overview

The Merrill MFG PRVNL50 is a 1/2" no-lead pressure relief valve crafted from durable brass with stainless steel springs, designed to protect cold water systems by safely relieving pressure up to 75 PSI. Featuring standard 1/2" NPT threaded connections and certified by IAMPO and NSF/ANSI 372, it ensures compliance and reliability for professional-grade plumbing installations.

## Description

Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass: desertcart.com: Industrial & Scientific

Review: Every home need one - 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 desertcart under different brands but I believe they are all the same. I should have bought a cheaper ones to save few dollars.
Review: Good product - 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.

## Features

- Pressure relief valves are for protection against excessive pressure
- 1/2 in. male NPT x 1/2 in. female FPT
- 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 | #35,023 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #17 in Relief Valves |
| Brand | Merrill |
| Brand Name | Merrill |
| Connector Type | Threaded |
| Customer Reviews | 4.6 out of 5 stars 203 Reviews |
| 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 | Brass |
| 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 |
| UPC | 642367450519 |
| Unit Count | 1 Count |
| 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 psi
- **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" Pressure Relief Valve, Brass - Image 1](https://m.media-amazon.com/images/I/314GOvz6pML.jpg)
![Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass - Image 2](https://m.media-amazon.com/images/I/51luDA+DKDL.jpg)
![Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass - Image 3](https://m.media-amazon.com/images/I/31+LEpZwMJL.jpg)
![Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass - Image 4](https://m.media-amazon.com/images/I/613OngKP+HL.jpg)
![Merrill MFG PRVNL50 1/2" Pressure Relief Valve, Brass - Image 5](https://m.media-amazon.com/images/I/71ioItPnqqL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Every home need one
*by L***G on 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 product
*by J***E on 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.

### ⭐⭐⭐⭐⭐ Quality and Cheaper on Amazon
*by L***E on August 8, 2024*

I purchased this after watching a Home Depot How To Video on YouTube. They were double the price at the common hardware stores when I needed it and I couldn't find this size in stock in store. Anyway, it worked for my pressure tank tee. And it's not the cheap, made in China lightweight material. It's pretty heavy.

## 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.com.ar/products/261832467-merrill-mfg-prvnl50-1-2-pressure-relief-valve-brass](https://www.desertcart.com.ar/products/261832467-merrill-mfg-prvnl50-1-2-pressure-relief-valve-brass)

---

*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-10-06*