420950840 Water Pump Housing Gasket for Sea-Doo GTS 1503 2015

Water Pump Housing Gasket for Sea-Doo

This water pump housing gasket seals the housing to the engine case on 1503-powered watercraft, and it cross-references OEM number 420950840.

Overview

This water pump housing gasket is a direct-fit sealing component for the 1503 engine used in Sea-Doo personal watercraft. The gasket creates a tight seal between the pump housing and the engine block to keep coolant contained and flowing correctly. It is intended for riders performing routine pump maintenance or rebuilding a cooling system on a 2015 GTS.

Built For Performance

• Precision-cut to match the 1503 water pump housing bolt pattern and port shape
• Seals coolant passages against leaks under pressure and heat cycling
• Cross-references OEM part number 420950840 for easy verification
• Fits between the housing and engine case without trimming or modification
• Suited to fresh water and salt water cooling systems

Fits These Machines

• for Sea-Doo GTS with 1503 engine, 2015

On-The-Job Use

• Replacing a weeping or blown housing gasket during pump service
• Cooling system rebuilds on 1503-equipped watercraft
• Routine maintenance before the riding season
• Repairs after overheating or coolant loss is diagnosed

Specs At A Glance

Good To Know

Q: Does this gasket need sealant during installation? A: Most water pump housing gaskets install dry on clean, flat mating surfaces, though some builders apply a thin film of suitable sealant. Clean both surfaces fully and torque the housing bolts to spec.

Q: How do I confirm this fits my watercraft? A: Match the OEM number 420950840 and confirm your engine is the 1503. Serial number and production changes can affect fitment, so verify before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.