Jabsco 6303-0003-P Nitrile Impeller & Gasket Kit

Jabsco Nitrile Impeller and Gasket Kit – 6303-0003-P / 6-63030003P

Product Description

The Jabsco 6303-0003-P is a six-blade nitrile flexible impeller kit for compatible Jabsco bilge pumps, Water Puppy pumps, macerator pumps and 37010-series electric marine toilets. Its nitrile construction is suited to pumping water that may contain oil, diesel fuel or waste material. The impeller uses a plastic hub with a single-flat drive.

Key Features

• Jabsco part number: 6303-0003-P
• Land 'N' Sea SKU: 6-63030003P
• Six flexible blades
• Nitrile construction
• Plastic hub insert
• Single-flat drive
• Impeller profile: H
• Outside diameter: 2 inches / 50.8 mm
• Width: 7/8 inch / approximately 22.3 mm
• Shaft diameter: 5/16 inch / approximately 7.9 mm
• UPC / GTIN: 671880570770

Kit Contents

The packaged service kit includes:

• Nitrile impeller: 6303-0003
• Paper gasket: 1985-0010
• Two paper gaskets: 18596-1000
• O-ring: 18753-0660
• Johnson-pattern O-ring: 05-06-590
• Impeller installation lubricant

Product Compatibility

Documented applications include:

• Jabsco 18680-0123 Water Puppy 12V Commercial Duty Pump
• Jabsco 18660-0121 Water Puppy 12V Standard Duty Pump
• Jabsco bilge pumps
• Jabsco 29X00-series pumps
• Jabsco 37010-series electric marine toilets
• Compatible macerator pumps
• Wastewater pumps requiring the 6303-0003-P specification

Fitment should be confirmed using the complete pump or toilet model because similar Jabsco impellers may share the same diameter while using different drive profiles or rubber compounds.

Fitment Notice

Before ordering, confirm that the original impeller requires:

• Six blades
• 2-inch outside diameter
• 7/8-inch width
• 5/16-inch shaft
• Single-flat drive
• Plastic hub
• Nitrile construction
• Profile H configuration

Do not confuse this part with the 6303-0001-P. The two impellers share the same principal dimensions and drive configuration, but 6303-0003-P is nitrile, while 6303-0001-P is neoprene. Nitrile is the preferred choice where oil, diesel fuel or waste contamination may be present. See also: Jabsco Neoprene Impeller Kit JAB-836-0001-P if your application calls for neoprene.

Alternate Compound – Same Dimensions

• Jabsco 6303-0007-P 6-Blade Polyurethane Impeller – same profile, polyurethane compound for raw water cooling
• Jabsco Neoprene Impeller Kit JAB-836-0001-P – neoprene compound for clean water service

When This Part Needs Replacement

Replace the impeller when:

• Pump output becomes weak or intermittent
• The pump struggles to prime
• The electric toilet or macerator drains slowly
• The blades become cracked, torn, swollen or permanently folded
• Pieces are missing from the impeller
• The plastic hub slips or becomes worn
• The pump has operated dry
• Scheduled preventive maintenance is due

Jabsco guidance recommends inspecting flexible impellers regularly and replacing them preventively rather than waiting for complete failure.

Installation Notes

• Disconnect electrical power before servicing the pump or toilet.
• Close any applicable seacock or isolation valve.
• Remove the pump cover and old sealing component.
• Pull the old impeller using suitable pliers or an impeller-removal tool.
• Do not pry against the pump face with a screwdriver.
• Remove any broken vane fragments from the pump and connected plumbing.
• Inspect the pump chamber, cover and shaft flat for wear.
• Lubricate the replacement impeller with the supplied lubricant.
• Align the flat inside the hub with the flat on the shaft.
• Install the correct gasket or O-ring for the pump model.
• Restore the water supply and test for proper flow and leaks.

Avoid running the flexible impeller pump dry.

Alternate / Superseded Part Numbers

• Current packaged part number: 6303-0003-P
• Earlier impeller number: 6303-0003
• Land 'N' Sea SKU: 6-63030003P
• Compact format: 63030003P
• Alternate catalogue format: 06303-0003-P
• Related reference: 6303-003-P
• Johnson Pump cross-reference: 09-824P
• CEF cross-reference: 500210
• Related pump reference: 23007-7813
• UPC / GTIN: 671880570770

Parts Desk Insight – Best Use

Choose the 6303-0003-P (nitrile) when the pump handles bilge water, wastewater, or any liquid that may carry petroleum contamination. Nitrile resists oil and diesel degradation that would swell or destroy a neoprene impeller. For clean fresh water, salt water or engine raw-water cooling circuits, verify whether the neoprene 6303-0001-P or polyurethane 6303-0007-P is the specified compound — using the wrong rubber in a clean-water cooling circuit can cause premature blade fatigue. When in doubt, match the compound to the original OEM specification for the pump model.