Part Number: AR2780
Category: Pressure Washer Parts → Pump Repair Kits → Check Valve Kits
Type: AR 2780 Check Valve Kit – OEM Replacement for XW & XWA Pressure Washer Pumps

The AR 2780 Check Valve Kit (Part #2780) is a genuine OEM replacement repair kit designed for servicing compatible Annovi Reverberi (AR) XW and XWA Series pressure washer pumps. This complete kit includes six complete check valve assemblies and twelve O-rings, providing the components needed to restore proper water flow, maintain operating pressure, and improve overall pump performance.

Key Features & Benefits

• Genuine AR (Annovi Reverberi) OEM check valve kit
• Part Number: 2780
• Complete check valve replacement kit
• Includes six complete valve assemblies and twelve O-rings
• Restores proper water flow and pressure
• Helps eliminate pressure loss caused by worn valves
• Maintains pump efficiency and performance
• Ideal for pump rebuilds and preventive maintenance
• OEM-quality fit and durability
• Designed for commercial and industrial pressure washer pumps

Kit Contents

The AR 2780 Check Valve Kit includes:

• (6) 1949050 – Complete Check Valve Assemblies
• (12) 1140450 – O-Rings (20.24 × 2.62 mm)

All components are genuine OEM AR replacement parts.

Technical Specifications

Part Number: 2780

Product Type: Check Valve Kit

Manufacturer: AR (Annovi Reverberi)

Compatible Pump Series: XW & XWA

OEM Replacement: Yes

Compatible Pump Models

Designed for use with compatible AR pumps, including:

• XW20
• XW22
• XW-M20
• XWA20
• XWA22
• XWA-M

Always verify your pump model before ordering.

Function of the Check Valve Kit

The check valve kit helps:

• Control one-way water flow through the pump
• Maintain proper operating pressure
• Prevent water backflow
• Improve pump efficiency
• Restore consistent pressure and flow
• Protect internal pump components from unnecessary wear

Replacing worn check valves helps restore pressure washer performance while maintaining reliable pump operation.

Common Signs Replacement Is Needed

Replace the check valve kit if you notice:

• Reduced operating pressure
• Pulsating pressure output
• Decreased water flow
• Pump surging
• Internal valve wear
• Worn or damaged O-rings
• Pump rebuild or scheduled preventive maintenance

Replacing worn valves early helps prevent additional wear to the manifold and other internal pump components.

Installation & Service Notes

• Shut down the pressure washer and relieve all system pressure.
• Remove the pump manifold according to the manufacturer's service procedures.
• Carefully remove the existing check valve assemblies and O-rings.
• Clean all valve bores and sealing surfaces thoroughly.
• Inspect the manifold for damage or debris.
• Install the new valve assemblies and O-rings in the proper orientation.
• Reassemble the pump and verify proper pressure and leak-free operation.

Important: Inspect water seals, packings, ceramic plungers, and valve seats during service. Replacing worn components together helps maximize pump reliability and service life.

Maintenance Recommendations

• Inspect check valves during routine pump maintenance.
• Replace worn valves at the first signs of pressure loss or pump surging.
• Use clean, filtered inlet water to reduce valve wear.
• Flush the pump after use when handling dirty or corrosive water.
• Use only genuine OEM AR replacement parts to maintain optimum pump performance, reliability, and long service life.