---
product_id: 60717041
title: "General Pump Trapped Pressure Unloader Valve - 21 GPM - 4050 PSI"
brand: "general pump"
price: "฿12955"
currency: THB
in_stock: true
reviews_count: 8
category: "General Pump"
url: https://www.desertcart.co.th/products/60717041-general-pump-trapped-pressure-unloader-valve-21-gpm-4050-psi
store_origin: TH
region: Thailand
---

# 4050 PSI max pressure 21 GPM flow rate 200°F max operating temp General Pump Trapped Pressure Unloader Valve - 21 GPM - 4050 PSI

**Brand:** general pump
**Price:** ฿12955
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your pressure washer game with the ultimate unloader valve!

## Quick Answers

- **What is this?** General Pump Trapped Pressure Unloader Valve - 21 GPM - 4050 PSI by general pump
- **How much does it cost?** ฿12955 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/60717041-general-pump-trapped-pressure-unloader-valve-21-gpm-4050-psi)

## Best For

- general pump enthusiasts

## Why This Product

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

## Key Features

- • **High-Pressure Mastery:** Rated for an impressive 4050 PSI, ensuring reliable operation under intense workloads.
- • **Optimized Thermal Resistance:** Operates safely up to 200°F, perfect for demanding cleaning tasks without compromise.
- • **Precision Engineered for Peak Performance:** Delivers a robust 21 GPM flow to maximize your pressure washer’s efficiency.
- • **Seamless Compatibility & Easy Installation:** Standard 1/2" NPT threaded connections for quick setup and universal fit.
- • **Unmatched Durability with Stainless Steel Build:** Crafted from premium stainless steel to outlast competitors and protect your investment.

## Overview

The General Pump Trapped Pressure Unloader Valve (Model YU21405) is a high-performance pressure relief valve designed for professional-grade pressure washers. Featuring a 21 GPM flow rate and a maximum pressure rating of 4050 PSI, it supports heavy-duty cleaning tasks with exceptional durability thanks to its stainless steel construction. Its 1/2" NPT threaded connections ensure easy installation and compatibility, while its 200°F max operating temperature makes it ideal for demanding environments. Trusted by pros, this valve extends pump life and boosts machine power, making it a top choice in pressure washer accessories.

## Description

General Pump Unloader YU21405. 21 GPM. 4050 PSI Rated Pressure. 200 F Max Temp. Inlet:(2) 1/2" NPT-F Outlet: 1/2" NPT-F Bypass:(2) 1/2" NPT-F Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.

Review: gp are good products - good quality, not from china
Review: Best in the market - I feel like this unloader is the bar none the best if you’re buying another unloader, you’re wasting your money this thing will give your machine 10 times more power and it will last your pump longer cause it’s made properly support your pump to its full potential

## Features

- New Improved Design
- Unloader Valve 4500 PSI 21 GPM 1/2" NPT
- Valve

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M1DXN7X |
| Best Sellers Rank | #98,366 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,130 in Pressure Washer Accessories |
| Brand Name | General Pump |
| Connector Type | Threaded |
| Customer Reviews | 4.8 4.8 out of 5 stars (53) |
| Exterior Finish | Stainless Steel |
| Inlet Connection Size | 0.5 Inches |
| Inlet Connection Type | National Pipe Tapered |
| Item Dimensions | 7 x 8 x 3 inches |
| Manufacturer | General Pump |
| Material Type | Stainless Steel |
| Maximum Pressure | 4050 Pound per Square Inch |
| Model Number | YU21405 |
| Number of Pieces | 1 |
| Number of Ports | 2 |
| Outlet Connection Size | 0.5 Inches |
| Outlet Connection Type | NPT |
| Size | 2.7 liters |
| Specification Met | ASME, ASTM, MSS SP 72 |
| Thread Size | 1/2 inches |
| Thread Type | National Pipe Tapered |
| UPC | 682491064305 |
| Unit Count | 1.0 Count |
| Valve Type | Pressure Relief Valve |

## Product Details

- **Brand:** General Pump
- **Exterior Finish:** Stainless Steel
- **Inlet Connection Size:** 0.5 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 7 x 8 x 3 inches
- **Material:** Stainless Steel
- **Maximum Operating Pressure:** 4050 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.5 Inches
- **Outlet Connection Type:** NPT

## Images

![General Pump Trapped Pressure Unloader Valve - 21 GPM - 4050 PSI - Image 1](https://m.media-amazon.com/images/I/71+-XXcatCL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ gp are good products
*by R***. on May 27, 2025*

good quality, not from china

### ⭐⭐⭐⭐⭐ Best in the market
*by J***H on June 4, 2023*

I feel like this unloader is the bar none the best if you’re buying another unloader, you’re wasting your money this thing will give your machine 10 times more power and it will last your pump longer cause it’s made properly support your pump to its full potential

### ⭐⭐⭐⭐⭐ Highly recommend for professional use.
*by M***Z on September 18, 2022*

This must be te most impressive unloader I have ever seen, massive robust heavy duty.

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**Shop now:** [https://www.desertcart.co.th/products/60717041-general-pump-trapped-pressure-unloader-valve-21-gpm-4050-psi](https://www.desertcart.co.th/products/60717041-general-pump-trapped-pressure-unloader-valve-21-gpm-4050-psi)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-04-26*