GP ZK7.1 Flow-Sensitive Unloader – 3500 PSI, 2.9–4.2 GPM | Replaces K7.1

Model: ZK7.1
Category: Pumps → Pump Accessories → Unloaders / Regulators
Type: Flow-Sensitive Unloader Valve – Genuine OEM General Pump

The GP ZK7.1 Flow-Sensitive Unloader is a genuine OEM General Pump pressure unloader engineered with a flow-through, flow-sensitive design to protect pressure washer systems from overpressure and pressure spikes. With no external moving parts or springs, this unloader offers enhanced reliability, simplified operation, and reduced maintenance compared to traditional spring-loaded unloaders.

Best Applications

• Single-pump pressure washer systems

• Systems using non-weep guns

• Applications requiring smooth pressure transitions

• Installations prioritizing reliability and low maintenance

Specifications

• Flow Range: 2.9–4.2 GPM

• Maximum Pressure: 3500 PSI

• Maximum Temperature: 165°F

• Inlet Port: 3/8″ BSP-F

• Outlet Port: 3/8″ BSP-M

• Bypass Port: 3/8″ BSP-F

Product Details

Brand: General Pump
OEM: Yes – Genuine General Pump Part
Application: Pressure Regulation / Pump Protection
Unloader Type: Flow-Sensitive / Flow-Through

Key Features

• Genuine OEM General Pump ZK7.1 unloader

• Flow-sensitive, flow-through design

• Eliminates high pressure in all lines during bypass

• Balanced piston for precise pressure adjustment

• Stainless steel and brass internal components

• No external springs or moving parts for improved reliability

• Easy to maintain and service

• Ideal for single-pump and non-weep gun systems