---
product_id: 537407633
title: "Merrill MFG 3/4\" Lead-Free Brass Pressure Relief Valve – 100 PSI Water System Safety Valve, NPT Thread, Durable Corrosion-Resistant Design for Well, Plumbing & Irrigation Systems"
brand: "merrill"
price: "4224 kr"
currency: ISK
in_stock: true
reviews_count: 2
url: https://www.desertcart.is/products/537407633-merrill-mfg-3-4-lead-free-brass-pressure-relief-valve
store_origin: IS
region: Iceland
---

# Lead-Free 3/4" NPT 100 PSI Merrill MFG 3/4" Lead-Free Brass Pressure Relief Valve – 100 PSI Water System Safety Valve, NPT Thread, Durable Corrosion-Resistant Design for Well, Plumbing & Irrigation Systems

**Brand:** merrill
**Price:** 4224 kr
**Availability:** ✅ In Stock

## Summary

> 🔒 Secure Your System with Confidence!

## Quick Answers

- **What is this?** Merrill MFG 3/4" Lead-Free Brass Pressure Relief Valve – 100 PSI Water System Safety Valve, NPT Thread, Durable Corrosion-Resistant Design for Well, Plumbing & Irrigation Systems by merrill
- **How much does it cost?** 4224 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/537407633-merrill-mfg-3-4-lead-free-brass-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

- • **Safety First:** Engineered to protect against excessive pressure, ensuring peace of mind.
- • **Durable Design:** Crafted from lead-free brass with stainless steel control springs for longevity.
- • **Certified Quality:** IAMPO Certified for reliability and performance in cold water systems.
- • **Easy Installation:** 3/4 in. male NPT x 3/4 in. female FPT connections for hassle-free setup.
- • **Compact & Efficient:** Measuring just 2.47 x 1.45 x 1.05 inches, it fits seamlessly into your system.

## Overview

The Merrill MFG PRVNL757100-3/4" Lead-Free Pressure Relief Valve is a robust and reliable solution designed to protect your cold water systems from excessive pressure. Made from durable lead-free brass and featuring stainless steel control springs, this valve is IAMPO certified, ensuring top-notch quality and safety. With a compact design and easy installation, it’s the perfect addition to your plumbing toolkit.

## Description

Merrill MFG PRVNL757100-3/4" Lead-Free Pressure Relief Valve, 100 PSI, Brass, NPT,

## Features

- Pressure relief valves are for protection against excessive pressure
- 3/4 in. male NPT x 3/4 in. female FPT
- Lead free brass with stainless steel control springs - IAMPO Certified
- 3/4" Line Connection, 100 PSI
- Not for use with water heaters -Cold water systems only

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Brass |
| Brand | Merrill |
| Item dimensions L x W x H | 2.47 x 1.45 x 1.05 inches |
| Exterior Finish | Stainless Steel |
| Inlet Connection Size | 0.75 Inches |
| Inlet Connection Type | National Pipe Tapered |
| Outlet Connection Type | MNPT |
| Maximum Operating Pressure | 1E+2 Pound per Square Inch |
| Valve Type | pressure relief |
| Manufacturer | Merrill Manufacturing Company |
| UPC | 642367453541 |
| Part Number | PRVNL757100-A |
| Item Weight | 6.9 ounces |
| Product Dimensions | 2.47 x 1.45 x 1.05 inches |
| Country of Origin | Taiwan |
| Item model number | PRVNL757100-A |
| Color | No Lead Brass |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Brass
- **Brand:** Merrill
- **Item dimensions L x W x H:** 2.47 x 1.45 x 1.05 inches
- **Exterior Finish:** Stainless Steel
- **Inlet Connection Size:** 0.75 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Outlet Connection Type:** MNPT
- **Maximum Operating Pressure:** 1E+2 Pound per Square Inch
- **Valve Type:** pressure relief
- **Manufacturer:** Merrill Manufacturing Company

## Images

![Merrill MFG 3/4" Lead-Free Brass Pressure Relief Valve – 100 PSI Water System Safety Valve, NPT Thread, Durable Corrosion-Resistant Design for Well, Plumbing & Irrigation Systems - Image 1](https://m.media-amazon.com/images/I/214dX4hFjNL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ I was told by my plumber that these should be inspected yearly.
*by G***4 on October 20, 2023*

Well who knew these things should be inspected yearly and replaced after 10 years. They stop your pipes or water heater from going boom splash. This one is for cold water only and was fitted to our pump. In the event that our filters get blocked it lets the excess water pressure out preventing the above mentioned water disaster. We had to buy a different version with a test handle for our hot water heater.

### ⭐⭐⭐ Have no way to test it but I presume it works
*by G***S on January 19, 2024*

When I replaced my 40+ year old well pressure tank I added this, which I believe is now required by code. I added an adapter so I can attach a standard garden hose to deal with any outflow.Hopefully this will never be needed but it's reassuring to know my crawl space won't flood if something goes wrong.(Note: for me, 3 stars is not a "bad" review. It just means the product does what it says. 4 stars is "better than expected", and the rare 5 stars is for "surprises and delights with how good it is". I wish more reviewers followed this instead of giving 5 stars to any product that simply works and isn't broken.)

## Frequently Bought Together

- Merrill MFG PRVNL757100-3/4" Lead-Free Pressure Relief Valve, 100 PSI, Brass, NPT,
- MEASUREMAN 0-100 PSI/kPa Water Pressure Gauge, Glycerin Filled,psi Gauge,for Home Water Pressure Test, 2-1/2’’ Dial, 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

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-10*