GP Pressure Washer Accumulator – 1300 PSI, 10 GPM Pulsation Dampener

Part Number: 2406
Category: Pressure Washer Parts → Pumps & Plumbing → Accumulators
Type: General Pump ZMACC Pressure Washer Accumulator – 1300 PSI, 10 GPM Pulsation Dampener

The General Pump ZMACC Pressure Washer Accumulator (Part #2406) is a genuine General Pump pulsation dampener designed to reduce pressure fluctuations, absorb hydraulic shock, and improve the overall performance of pressure washer systems. Pre-charged with 90–200 PSI air, this accumulator minimizes pump pulsation and water hammer, helping protect pumps, unloaders, gauges, hoses, valves, and other high-pressure plumbing components from excessive wear.

Key Features & Benefits

• Genuine General Pump accumulator
• Part Number: 2406
• Model: ZMACC
• Pressure pulsation dampener
• Factory 90–200 PSI air pre-charge
• 3/4" Female NPT connection
• Rated for systems up to 1,300 PSI
• Supports flow rates up to 10 GPM
• Rebuildable design for extended service life
• Reduces pump pulsation and pressure spikes
• Helps minimize water hammer
• Protects pumps, unloaders, hoses, gauges, and fittings
• Improves pressure stability and system performance
• Suitable for commercial and industrial applications

Technical Specifications

Part Number: 2406

Manufacturer: General Pump

Model: ZMACC

Product Type: Pressure Washer Accumulator / Pulsation Dampener

Connection Size: 3/4" Female NPT

Maximum Working Pressure: 1,300 PSI

Maximum Flow Rate: 10 GPM

Pre-Charge: 90–200 PSI Air

Rebuildable: Yes

OEM Replacement: Yes

Compatible Applications

Suitable for use with:

• Commercial pressure washers
• Industrial pressure washing systems
• Cold water pressure washers
• Agricultural sprayers
• Pump protection systems
• High-pressure fluid transfer equipment
• Wash bay equipment
• Industrial cleaning systems
• Chemical transfer systems
• Water pumping applications

Always verify pressure rating, flow requirements, and plumbing compatibility before ordering.

Function of the Accumulator

The General Pump ZMACC Accumulator helps:

• Absorb pump pulsation
• Reduce hydraulic shock and water hammer
• Smooth pressure fluctuations
• Improve pressure consistency
• Reduce vibration throughout the system
• Protect pumps, unloaders, gauges, hoses, valves, and fittings
• Extend the service life of pressure washer components

The adjustable 90–200 PSI air pre-charge creates an air cushion that absorbs pressure spikes generated during normal pump operation.

Common Signs Replacement or Service Is Needed

Service or rebuild the accumulator if you notice:

• Increased pressure pulsation
• Excessive system vibration
• Water hammer or hydraulic shock
• Reduced pressure stabilization
• External leakage
• Physical damage or corrosion
• Loss of air pre-charge

Because the accumulator is rebuildable, worn internal components can often be replaced instead of replacing the entire unit.

Installation & Service Notes

Turn off the pressure washer and relieve all system pressure before installation.

Install the accumulator using the 3/4" Female NPT connection in the location recommended by the equipment manufacturer.

Apply an appropriate thread sealant where required and tighten fittings securely without overtightening.

Verify the air pre-charge is set within the recommended 90–200 PSI range before placing the system into operation.

Inspect all connections for leaks and verify smooth system performance after installation.

Important: Never exceed the maximum 1,300 PSI working pressure or 10 GPM flow rate. Maintain the proper air pre-charge and rebuild the accumulator with compatible replacement parts as needed to ensure optimal performance.

Maintenance Recommendations

• Inspect the accumulator regularly for leaks, corrosion, or physical damage.
• Check and maintain the air pre-charge according to the equipment manufacturer's recommendations.
• Monitor system performance for increased pulsation or vibration.
• Inspect threaded connections during routine maintenance.
• Rebuild the accumulator when internal components show signs of wear.
• Use only genuine General Pump replacement parts to maintain proper fit, reliable performance, and maximum service life.