---
product_id: 19923408
title: "Watts Sea 66100 100XL-4 3/4\" 150 Psi 100Xl-4 T & P Relief Valve"
brand: "watts"
price: "$55.05"
currency: USD
in_stock: true
reviews_count: 10
category: "Watts"
url: https://www.desertcart.us/products/19923408-watts-sea-66100-100xl-4-3-4-150-psi-100xl
store_origin: US
region: United States of America
---

# Temperature Control 3/4" Size Proudly Made in USA Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve

**Brand:** watts
**Price:** $55.05
**Availability:** ✅ In Stock

## Summary

> 🔝 Elevate Your Control Game!

## Quick Answers

- **What is this?** Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve by watts
- **How much does it cost?** $55.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/19923408-watts-sea-66100-100xl-4-3-4-150-psi-100xl)

## 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

- • **Durable Construction:** Built to withstand the test of time.
- • **User-Friendly Design:** Simple installation for hassle-free use.
- • **Precision Engineering:** Crafted for optimal performance and reliability.
- • **Versatile Compatibility:** Easily integrates with various systems.
- • **Efficient Temperature Regulation:** Ensures consistent performance in any environment.

## Overview

The Watts Temp/Rlf Vlv 3/4" Mxf is a high-quality valve designed for precise temperature regulation and reliable performance. Proudly made in the USA, this durable and versatile component is perfect for a variety of applications, ensuring seamless integration and long-lasting efficiency.

## Description

OEM Replacement Parts / Equipment

Review: Perfect - Perfect fit. Exact replacement. Leaks after a season. Mainly because its the only way to bleed air from water heater. Cheap item to have for a spare
Review: Relief Valve - Very easy to install. Great quality.

## Features

- Made in United States

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002QYIRN0 |
| Best Sellers Rank | #79,754 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #63 in Relief Valves |
| Brand | Watts |
| Brand Name | Watts |
| Connector Type | Threaded |
| Customer Reviews | 4.7 out of 5 stars 150 Reviews |
| Exterior Finish | Bronze |
| Included Components | Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve |
| Item Dimensions | 1 x 1 x 1 inches |
| Item Type Name | Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve |
| Item Weight | 4.8 ounces |
| Item dimensions L x W x H | 1 x 1 x 1 inches |
| Manufacturer | Watts Sea |
| Manufacturer Part Number | 66100100XL4 |
| Manufacturer Warranty Description | Warranty |
| Material | Bronze |
| Material Type | Bronze |
| Maximum Operating Pressure | 150 Pound per Square Inch |
| Maximum Pressure | 150 Pound per Square Inch |
| Model Number | 66100 100XL-4 |
| Number of Pieces | 100 |
| Number of Ports | 2 |
| Outlet Connection Size | 0.75 Inches |
| Outlet Connection Type | FNPT |
| Set Name | 100XL-4 |
| Size | No Size |
| Specification Met | oem |
| Thread Size | 3/4 in |
| Thread Type | NPT |
| UPC | 098268000016 |
| Unit Count | 1.0 Count |
| Valve Type | Pressure Relief Valve |

## Product Details

- **Brand:** Watts
- **Exterior Finish:** Bronze
- **Item dimensions L x W x H:** 1 x 1 x 1 inches
- **Manufacturer:** Watts Sea
- **Material:** Bronze
- **Maximum Operating Pressure:** 150 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.75 Inches
- **Outlet Connection Type:** FNPT
- **Specification Met:** oem

## Images

![Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve - Image 1](https://m.media-amazon.com/images/I/61B9NsCWpZL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect
*by A***R on April 18, 2026*

Perfect fit. Exact replacement. Leaks after a season. Mainly because its the only way to bleed air from water heater. Cheap item to have for a spare

### ⭐⭐⭐⭐⭐ Relief Valve
*by D***G on April 28, 2026*

Very easy to install. Great quality.

### ⭐⭐⭐⭐⭐ Easy change out
*by S***S on February 16, 2026*

Replaced a leaking relief valve on a 40 gallon water heater, easy change out, and water heater back to normal.

## Frequently Bought Together

- Watts Sea 66100 100XL-4 3/4" 150 Psi 100Xl-4 T & P Relief Valve
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**Shop now:** [https://www.desertcart.us/products/19923408-watts-sea-66100-100xl-4-3-4-150-psi-100xl](https://www.desertcart.us/products/19923408-watts-sea-66100-100xl-4-3-4-150-psi-100xl)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-13*