---
product_id: 374418875
title: "Watts 3/4LFN36-M2 0556031, 3/4\""
brand: "watts"
price: "$2346"
currency: MXN
in_stock: true
reviews_count: 5
category: "Watts"
url: https://www.desertcart.mx/products/374418875-watts-3-4lfn36-m2-0556031-3-4
store_origin: MX
region: Mexico
---

# Max steam pressure 15 psi Max temp 250°F 3/4" compact size Watts 3/4LFN36-M2 0556031, 3/4"

**Brand:** watts
**Price:** $2346
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water system with compact, lead-free confidence!

## Quick Answers

- **What is this?** Watts 3/4LFN36-M2 0556031, 3/4" by watts
- **How much does it cost?** $2346 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/374418875-watts-3-4lfn36-m2-0556031-3-4)

## 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

- • **Lead-Free Construction:** Ensures safe, eco-conscious operation for your water system.
- • **Robust Pressure Handling:** Withstands steam pressures up to 15 psi, safeguarding your setup.
- • **Sleek Low-Profile Design:** Fits effortlessly in tight spaces without compromising performance.
- • **High-Temperature Resilience:** Operates reliably up to 250°F for maximum durability.
- • **Trusted Quality & Peace of Mind:** Backed by 4.9-star reviews and industry certifications (CSA, ANSI).

## Overview

The Watts 3/4LFN36-M2 0556031 is a compact, lead-free vacuum relief valve designed for water heaters and tank systems. It features a low-profile brass construction, supports maximum steam pressure of 15 psi, and withstands temperatures up to 250°F. Certified to CSA and ANSI standards, it offers reliable, leak-free performance trusted by professionals and homeowners alike.

## Description

Watts LFN36M1 3/4" Lead Free Vacuum Relief Valve (0556031)

Review: This low-profile vacuum relief valve was exactly what I needed for my water heater setup. It installed easily, sealed tightly, and immediately gave me peace of mind knowing the pressure relief is working as it should. The compact, low-profile design is great for tight spaces and doesn’t get in the way. No leaks, no issues, just solid performance. Great quality and a small but important upgrade for any tank system!
Review: Good quality, happy with its function.

## Features

- Low profile
- Lead free construction
- Maximum steam pressure 15 psi
- Maximum temperature 250 degrees

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007VHIEMG |
| ASIN  | B007VHIEMG |
| Batteries Included? | No |
| Batteries Required? | No |
| Customer Reviews | 4.9 4.9 out of 5 stars (99) |
| Customer reviews | 4.9 4.9 out of 5 stars (99) |
| Date First Available | 14 August 2013 |
| Date First Available  | 14 August 2013 |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 113 g |
| Item model number | Watts LFN36-M1 |
| Item model number  | Watts LFN36-M1 |
| Manufacturer | Watts |
| Manufacturer  | Watts |
| Material | Brass |
| Part number | 556031 |
| Product Dimensions | 2.54 x 2.54 x 2.54 cm; 113.4 g |
| Product Dimensions  | 2.54 x 2.54 x 2.54 cm; 113.4 g |
| Size | 0.75 Inch |
| Specification met | CSA, ANSI Z21.22 |

## Product Details

- **Brand:** WATTS
- **Exterior finish:** Brass
- **Inlet connection size:** 0.75 Millimeters
- **Item dimensions L x W x H:** 25 x 25 x 25 millimeters
- **Material:** Brass

## Images

![Watts 3/4LFN36-M2 0556031, 3/4" - Image 1](https://m.media-amazon.com/images/I/71Ltwi7ltqL.jpg)
![Watts 3/4LFN36-M2 0556031, 3/4" - Image 2](https://m.media-amazon.com/images/I/716uBFqXlKL.jpg)
![Watts 3/4LFN36-M2 0556031, 3/4" - Image 3](https://m.media-amazon.com/images/I/81pehpW7wqL.jpg)

## Questions & Answers

**Q: Any advise on installation on top of the water heater tank? Should it be on the cold line, close to the heater, highest point?**
A: my hot water heater has one mounted on the very top.

**Q: has anyone used this in a solar heater panel and it works?**
A: I used it to replace an old leaky one in a solar heater for a swimming pool. It definitely works. Make sure you apply some Teflon tape (2-3 rounds ) and don’t thread it on absurdly tight especially if it’s on a plastic pipe.

**Q: Is this a one way valve? meaning, it will allow air to enter a portable water tank as a 3gpm pump pulls water out? will it stop water from sloshing?**
A: It's a vacuum relief valve so when the pump shuts off the spring loaded stopper is pulled down by the vacuum releasing air and once the vacuum is gone it return to the closed position. Similar to an anti-siphon valve on a sprinkler valve.

**Q: This is definitely 3/4"?**
A: Yes the one I received was 3/4 npt.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by K***. on 19 July 2025*

This low-profile vacuum relief valve was exactly what I needed for my water heater setup. It installed easily, sealed tightly, and immediately gave me peace of mind knowing the pressure relief is working as it should. The compact, low-profile design is great for tight spaces and doesn’t get in the way. No leaks, no issues, just solid performance. Great quality and a small but important upgrade for any tank system!

### ⭐⭐⭐⭐⭐ Review
*by T***R on 31 October 2025*

Good quality, happy with its function.

### ⭐⭐⭐⭐⭐ Review
*by J***A on 16 January 2024*

Simple screw in installation once you have your line teed. Allows air to enter to ensure water doesn't leave the tank and so far appears to do it's job. I bought a spare to keep around as I feel it's one of those things that may decide to go bad at some point and it doesn't appear you can buy this at any of the box or hardware stores around me

## Frequently Bought Together

- Watts LFN36-M1 Water Service Low Profile Vacuum Relief Valve for Water and Heater Tanks, 3/4 inch
- NBPLUS Vacuum Relief Valve 1/2 Inch, Low Profile Vac Breaker Valve Compatible with Watts LFN36-M1 Water and Heater Tanks, Brass Leak Proof

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-02-14*