Part Number: 3401
Category: Pressure Washer Parts → Pump Repair Kits → Packing & Seal Kits
Type: AR 1857 Packing Kit – 18mm XR High & Low Pressure Seal Kit

The AR 1857 Packing Kit (Part #1857) is a genuine OEM seal repair kit designed for servicing compatible Annovi Reverberi (AR) high-pressure pumps. This kit includes the essential 18 mm high-pressure packings, low-pressure seals, and O-rings required to restore proper sealing performance and help eliminate leaks caused by normal wear.

Key Features & Benefits

• Genuine AR (Annovi Reverberi) OEM packing kit
• Part Number: 1857
• Complete 18 mm high and low pressure seal kit
• Includes OEM high-pressure packings, low-pressure seals, and O-rings
• Restores proper sealing performance
• Helps eliminate pressure loss and water leakage
• Extends pump service life
• Ideal for pump rebuilds and preventive maintenance
• OEM-quality fit and performance
• Designed for commercial and industrial pressure washer pumps

Kit Contents

The AR 1857 Packing Kit includes:

• (3) 880320 — 18 mm High-Pressure Packings
• (3) 961240 — O-Rings (31.47 × 1.78 mm)
• (3) 880330 — 18 mm Low-Pressure Seals

Technical Specifications

Part Number: 1857

Product Type: Packing & Seal Kit

Manufacturer: AR (Annovi Reverberi)

Seal Size: 18 mm

OEM Replacement: Yes

Compatible Pump Models

Designed for use with compatible AR pumps, including:

• RK18
• RKA18
• RKV

Always verify your pump model and seal size before ordering.

Function of the Packing Kit

The packing kit helps:

• Seal around the ceramic plungers
• Maintain proper operating pressure
• Prevent high-pressure water bypass
• Reduce external water leakage
• Protect internal pump components from premature wear
• Restore pump efficiency after seal wear

Replacing worn packings and seals helps maintain peak cleaning performance while reducing the risk of costly pump damage.

Common Signs Replacement Is Needed

Replace the packing kit if you notice:

• Water leaking from the pump manifold
• Loss of operating pressure
• Reduced water flow
• Worn or damaged packings
• Cracked or hardened seals
• Water entering the crankcase
• Pump rebuild or scheduled maintenance

Replacing the seals at the first signs of wear helps prevent additional damage to plungers, manifolds, and other internal components.

Installation & Service Notes

• Shut down the pressure washer and relieve all system pressure.
• Remove the pump manifold according to the manufacturer's service procedure.
• Carefully remove the old packings, seals, and O-rings.
• Clean all sealing surfaces and inspect the ceramic plungers for wear or damage.
• Lubricate the new seals lightly before installation.
• Install all new components in the correct orientation.
• Reassemble the pump and test for proper pressure and leak-free operation.

Important: Inspect ceramic plungers, valve assemblies, and bearings during service. Replacing worn components at the same time helps maximize pump reliability and service life.

Maintenance Recommendations

• Inspect packings and seals during routine pump maintenance.
• Replace seals at the first signs of leakage or pressure loss.
• Keep inlet water properly filtered to reduce seal wear.
• Avoid running the pump dry, as this can rapidly damage sealing components.
• Use only genuine OEM AR replacement parts to maintain optimum pump performance, reliability, and long service life.