General Pump Trapped Pressure Unloader Valve – 21 GPM / 4050 PSI

Overview

Meet the General Pump Unloader YU21405, a robust component designed to help regulate pressure and flow in your pressure washer setup. It supports up to 21 GPM and is rated for pressures up to 4050 PSI, with a maximum operating temperature around 200 F.

Key to fast, reliable installations are standardized 1/2 NPT-F ports and a compact design that fits many configurations. The unit features two 1/2 NPT-F inlets, a 1/2 NPT-F outlet, and two bypass ports, giving you flexible plumbing options.

Key specifications

• Inlet: (2) 1/2 NPT-F
• Outlet: 1/2 NPT-F
• Bypass: (2) 1/2 NPT-F
• Maximum temperature: 200 F
• Flow rating: 21 GPM
• Rated pressure: up to 4050 PSI
• Unloader component listed for up to 4500 PSI

Design and benefits

The unit showcases a New Improved Design that aims to deliver dependable performance in busy work environments. Its unloader valve works with standard fittings to help you manage pressure safely without significant system rework. While not a guarantee of outcomes, many users find this type of unloader helpful for keeping the cleaning workflow smooth and predictable.

• New Improved Design for durable, long-lasting use
• Compact, 1/2 NPT porting simplifies installation
• Built-in bypass paths support flexible plumbing and relief routing

Use cases and practical notes

Ideal for pressure washer rigs that require reliable unloading and flow control in moderate to heavy-duty tasks. This valve can be paired with a compatible pump and hoses to tailor performance to your cleaning needs. Benefits are described as possibilities based on the unit's specifications and common usage patterns.

Safety note: This product includes a California warning due to chemical exposure potential. Always follow all installation and safety instructions when integrating with your system.