---
product_id: 75972174
title: "Matsui 3/4 inch, 3/4\" Isolation Valve Kit with Pressure Relief Valve for Tankless Water Heater,FNPT x FNPT, Compatible with Rinnai, Jacuzzi, Rheem, Navien, Noritz, Takagi, Bosch,etc …"
brand: "matsui"
price: "$202.95"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.ec/products/75972174-matsui-3-4-inch-3-4-isolation-valve-kit-pressure
store_origin: EC
region: Ecuador
---

# 100% leak tested with pressure relief valve 3/4" FNPT x FNPT connections Heavy-duty forged brass build Matsui 3/4 inch, 3/4" Isolation Valve Kit with Pressure Relief Valve for Tankless Water Heater,FNPT x FNPT, Compatible with Rinnai, Jacuzzi, Rheem, Navien, Noritz, Takagi, Bosch,etc …

**Brand:** matsui
**Price:** $202.95
**Availability:** ✅ In Stock

## Summary

> 🚿 Elevate your water heater setup with precision and peace of mind!

## Quick Answers

- **What is this?** Matsui 3/4 inch, 3/4" Isolation Valve Kit with Pressure Relief Valve for Tankless Water Heater,FNPT x FNPT, Compatible with Rinnai, Jacuzzi, Rheem, Navien, Noritz, Takagi, Bosch,etc … by matsui
- **How much does it cost?** $202.95 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/75972174-matsui-3-4-inch-3-4-isolation-valve-kit-pressure)

## Best For

- matsui enthusiasts

## Why This Product

- Trusted matsui brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Friendly Design:** Unique hexagon lever prevents misuse while color-coded handles simplify hot/cold valve identification.
- • **Space-Savvy Compactness:** Slim profile fits effortlessly into recess boxes and pipe covers for a clean, professional installation.
- • **Universal Compatibility:** Seamlessly works with top brands like Rinnai, Jacuzzi, Rheem, Navien, Noritz, Takagi, and Bosch.
- • **Smart Safety Integration:** Includes a pressure relief valve to protect your tankless water heater from overpressure risks.
- • **Precision Engineered Durability:** Forged brass construction ensures long-lasting, corrosion-resistant performance.

## Overview

The Matsui 3/4 inch Isolation Valve Kit is a robust, brass-constructed plumbing essential designed for tankless water heaters. Featuring FNPT x FNPT connections, a pressure relief valve, and a unique hexagon lever, it guarantees leak-free, safe operation. Its compact, color-coded design ensures easy installation and compatibility with leading brands, making it the smart choice for modern, efficient water heating systems.

## Description



## Features

- Heavy duty forged brass construction, unique hexagon lever designed to prevent misuse.
- Compact design for easy fit with recess box/pipe cover, color coded valve handles for easy identification of hot and cold valves.
- 100% leak tested, standard brass version, pressure relief valve included.
- Complies with NSF/ANSI 61
- FNPT x FNPT Thread connection

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Brass |
| Brand | Matsui |
| Item dimensions L x W x H | 12 x 6 x 4 inches |
| Exterior Finish | Brass |
| Inlet Connection Size | 0.75 Inches |
| Inlet Connection Type | FNPT |
| Outlet Connection Type | FNPT |
| Number of Ports | 2 |
| Outlet Connection Size | 0.75 Inches |
| Specification Met | NSF/ANSI 61 |
| Manufacturer | Matsui |
| UPC | 766156005190 |
| Item Weight | 4 pounds |
| Product Dimensions | 12 x 6 x 4 inches |
| Item model number | 5e7cecb1-fdca-4fa3-b665-ff7584cd9273 |
| Is Discontinued By Manufacturer | No |
| Size | FNPT x FNPT |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Brass
- **Brand:** Matsui
- **Item dimensions L x W x H:** 12 x 6 x 4 inches
- **Exterior Finish:** Brass
- **Inlet Connection Size:** 0.75 Inches
- **Inlet Connection Type:** FNPT
- **Outlet Connection Type:** FNPT
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.75 Inches
- **Specification Met:** NSF/ANSI 61

## Images

![Matsui 3/4 inch, 3/4" Isolation Valve Kit with Pressure Relief Valve for Tankless Water Heater,FNPT x FNPT, Compatible with Rinnai, Jacuzzi, Rheem, Navien, Noritz, Takagi, Bosch,etc … - Image 1](https://m.media-amazon.com/images/I/71LzM5Go0fL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Japanese quality, robust brass thickness, non rust valve stops
*by F***T on June 23, 2019*

Matsui isolation valve is the best design I have found. The products are now made in China to Japanese specifications in order to reduce the cost. Therefore, better value for the customer. This kit allows for the annual “flush cleaning” of limescale in a water tank, heater, or tankless water heater. The tiny stop valves open and close in tight spaces and are quality thickness. Competitor valves are are large arms - typical shut-off levers. These always show corrosion after one year and get worse on the metal arm and the cold zinc coated nuts. I pay a premium for Matsui to get quality that will last longer than my lifetime. The recommended valves that all tankless water heater makers recommend and sometimes RE-brand with their corporate name; eg. Rinnai Isolation Valve kit is in fact Matsui Isolation Valve Kit, same for Noritz, etc. Can not go wrong with this unit!

### ⭐⭐⭐⭐⭐ These came with Rinnai right on the handles!
*by R***. on February 18, 2024*

These came with Rinnai right on the handles so they will go great on my Rinnai on demand water heater...heavy duty hardware. Very nice!

### ⭐⭐⭐⭐⭐ Perfect fit and quality
*by L***L on October 8, 2018*

Used on my Rinnai R98LS that was only originally installed with a cold inlet shutoff. Now I can shut it off both sides, flush it with ease and I have a PRV for emergencies. Used Sharkbite fittings to plumb into house. Replaced everything in about 1 hour. Valves are super smooth and all machining was excellent. Great product, fast order shipping and well packaged.

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-03-07*