Jabsco Impeller Kit - 12 Blade - Neoprene - 3-¾" Diameter - Brass Insert - Spline Drive

The Jabsco Impeller Kit – 12 Blade – Neoprene – 3-¾" Diameter – Brass Insert – Spline Drive is a direct-replacement circulation pump impeller engineered for marine and automotive cooling systems where reliable fluid transfer is non-negotiable. Whether you're maintaining a high-performance marine engine, a heavy-duty industrial cooling loop, or a custom automotive water circulation setup, this impeller kit restores flow capacity and thermal management efficiency in systems relying on positive-displacement pump operation. Jabsco has been the go-to OEM supplier for decades, and this genuine replacement component ensures your system performs exactly as designed.

The 12-blade design with a 3-¾" diameter provides optimal volumetric efficiency and smooth, pulsation-free fluid displacement—critical for systems handling saltwater, coolant, or fuel transfer applications. Neoprene construction resists degradation from heat cycling, UV exposure, and chemical contact, making it ideal for both freshwater and corrosive marine environments. The brass insert reinforces the spline-drive connection, preventing shaft wear and ensuring the impeller maintains a positive lock under continuous load; the 2-9/16" shaft diameter and 1" shaft width are precision-engineered to match OEM pump housings without modification. Spline-drive engagement distributes rotational force evenly across multiple contact points, eliminating slippage and reducing cavitation—a silent killer of pump efficiency that degrades performance over months of operation.

Technicians and marine mechanics rely on this impeller kit when OEM cooling systems show signs of reduced flow, rising operating temperatures, or cavitation noise—all indicators of impeller wear or blade degradation. Installation is straightforward on any Jabsco pump equipped with spline-drive compatibility; disconnect the pump housing, remove the worn impeller, and press the new brass-insert assembly into place using a light arbor press to ensure squareseating. At 1.4 lbs and compact dimensions (6 x 5 x 10 in), it ships easily and stores alongside your maintenance inventory. This is a direct OEM replacement backed by the reliability that automotive and marine professionals demand when system failures are not an option.