The KOSHIN 0120081 Impeller (also referenced in exploded views as part number 012008101) is an authentic original equipment manufacturer (OEM) replacement part designed for Koshin’s line of compact 1-inch (25mm) gasoline-powered centrifugal water pumps.

Key Specifications

• Manufacturer: Koshin Ltd. (Japan)

• Part Number: 0120081

• Material: ADC (Aluminum Die Casting)

• Component Type: Centrifugal Water Pump Impeller

Model Compatibility

This specific impeller is precision-engineered to fit and function within the following Koshin water pump models:

• SE-25FH: 1-inch clear water pump (typically paired with the Robin/Subaru EH035 engine).

• SEV-25F: 1-inch clear water pump (typically paired with the Koshin K35 engine).

Function and Performance

As the core rotating component of the pump, the impeller threads directly onto the engine's drive shaft. When the engine runs, the impeller's high-speed rotation creates a pressure differential that draws water through the suction flange. The curved vanes of the impeller catch the fluid and rapidly accelerate it outward using centrifugal force, pushing the water through the volute casing and out of the discharge port at a high flow rate.