Part Number: 5019.0703.00
Category: Pressure Washer Parts → Pump Repair Kits → Water Seal Kits
Type: Comet 5019.0703.00 18mm Water Seal Kit – OEM Replacement for FW & FW2 Pressure Washer Pumps

The Comet 5019.0703.00 18mm Water Seal Kit (Part #5019.0703.00) is a genuine OEM replacement repair kit designed for servicing compatible Comet FW and FW2 Series pressure washer pumps equipped with 18 mm ceramic plungers. Engineered for hot water pressure washer applications, this complete water seal replacement kit restores proper sealing around the plungers, helping maintain operating pressure, reduce internal water bypass, eliminate leaks, and maximize pump efficiency.

Key Features & Benefits

• Genuine Comet OEM 18 mm water seal kit
• Part Number: 5019.0703.00
• Complete hot water seal replacement kit
• Designed for Comet FW and FW2 Series pressure washer pumps
• Compatible with 18 mm ceramic plungers
• Engineered for hot water pressure washer applications
• Restores proper water sealing performance
• Helps eliminate internal water bypass
• Maintains operating pressure and pump efficiency
• Ideal for pump rebuilds and preventive maintenance
• OEM-quality fit and long service life

Technical Specifications

Part Number: 5019.0703.00

Product Type: Water Seal Kit

Manufacturer: Comet Pumps

Seal Size: 18 mm

Application: Hot Water Pressure Washer Pumps

Compatible Pump Series: FW & FW2

OEM Replacement: Yes

Compatible Pump Models

Designed for use with compatible Comet FW and FW2 Series pressure washer pumps equipped with 18 mm ceramic plungers.

Always verify your pump model and plunger size before ordering by referencing your owner's manual or pump identification tag.

Function of the Water Seal Kit

The water seal kit helps:

• Seal around the ceramic plungers
• Maintain proper operating pressure
• Prevent internal water bypass
• Reduce external water leakage
• Improve pump efficiency
• Extend pressure washer pump service life

Replacing worn water seals helps restore pressure washer performance while protecting additional internal pump components from premature wear.

Common Signs Replacement Is Needed

Replace the water seal kit if you notice:

• Water leaking from the pump manifold
• Reduced operating pressure
• Internal water bypass
• Worn or heat-damaged seals
• Reduced water flow
• Pump rebuild or scheduled preventive maintenance
• Reduced cleaning performance

Replacing worn seals promptly helps prevent damage to ceramic plungers, manifolds, and other critical pump components.

Installation & Service Notes

• Shut down the pressure washer and relieve all system pressure.
• Allow the pump to cool completely before servicing hot water equipment.
• Remove the pump manifold according to the manufacturer's service procedures.
• Carefully remove the existing water seals and related sealing components.
• Clean all sealing surfaces thoroughly.
• Inspect ceramic plungers, high-pressure seals, O-rings, and the manifold for wear or damage.
• Install the new OEM water seals in the correct orientation.
• Reassemble the pump and verify proper pressure and leak-free operation.

Important: Inspect ceramic plungers, packings, check valves, oil seals, and O-rings during service. Replacing related wear components at the same time helps maximize pump reliability and long-term performance, especially in high-temperature applications.

Maintenance Recommendations

• Inspect water seals during routine pump maintenance.
• Replace worn seals at the first signs of leakage or pressure loss.
• Maintain clean, filtered inlet water to minimize seal wear.
• Never operate the pump without an adequate water supply.
• Use only genuine OEM Comet replacement parts to maintain optimum pump performance, reliability, and long service life in hot water pressure washer systems.