Johnson Pumps 09-810B-9 F4B Flexible Impeller Nitrile Oil-Resistant Marine Pump

The Johnson Pumps 09-810B-9 is a genuine OEM nitrile flexible impeller designed for Johnson Pump F4B flexible impeller pumps used in marine and RV cooling and fluid transfer applications. Made from oil-resistant Nitrile compound, this impeller is specifically engineered for systems that handle diesel fuel or light oils, making it the correct choice over standard neoprene or MC97 impellers in those environments.

A worn or damaged impeller can lead to system failure or engine overheating. Johnson Pump impellers are developed and manufactured for maximum flow efficiency and long service life, meeting the strict performance and dimensional specifications set by original equipment engine manufacturers.

Key Features:

• Material: Nitrile (oil-resistant) — ideal for diesel and light oil applications
• Pump Compatibility: Johnson Pump F4 / F4B flexible impeller pumps
• Outer Diameter: 2.00" (50.8 mm)
• Inner Diameter: 0.47" (12 mm)
• Width: 0.87" (22 mm)
• Genuine Johnson Pump OEM replacement part
• Manufactured to strict OEM engine manufacturer specifications
• Designed for maximum coolant flow and long service life

For cooling system applications (non-oil environments), the MC97 or Neoprene impeller 09-810B-1 is recommended instead. Annual impeller replacement is strongly advised to maintain reliable pump performance and prevent unexpected failures. Always use a genuine Johnson Pump impeller to ensure proper fit and function.