Jabsco Flexible Impeller, 12 Blade, 3-3/4 in x 2-1/2 in x 1 in, Brass Spline Drive

Overview

The Jabsco 17935 Flexible Impeller is a large spline-drive replacement impeller for compatible marine flexible impeller pumps used in raw-water cooling, bilge, and transfer applications. The range uses a 12-blade impeller profile with a 3-3/4 in. diameter, 2-1/2 in. depth, and 1 in. shaft size, giving buyers clear fit points to check against the pump body and existing impeller before installation.

This product is offered in two material versions: neoprene and nitrile. Neoprene is the common choice for engine cooling and general water pumping where fuel or oil exposure is limited, while nitrile is used where the pumped water may be contaminated with oil or diesel, such as bilge or certain transfer duties.

As with any flexible impeller, fit should be confirmed by matching the existing impeller dimensions, shaft style, blade count, and pump model. Keeping a spare on board is practical for cruising and fishing boats because an impeller can be damaged by dry running, blocked intakes, air leaks, or restricted raw-water flow.

Key features

• 12-blade flexible impeller for marine pump service where the pump requires the Jabsco 17935 profile.
• Spline-drive hub with a 1 in. shaft size for pumps using this drive configuration.
• 3-3/4 in. diameter and 2-1/2 in. depth help confirm fit against the removed impeller before replacement.
• Available in neoprene for general raw-water cooling and nitrile for oily or fuel-contaminated water duties.
• Useful as a scheduled maintenance part or as an onboard spare for trips where raw-water pump downtime is a serious problem.

Variants

The Jabsco 17935 Flexible Impeller is offered in two configurations that share the same general impeller size and spline-drive format, with the material changing by variant.

The material choice affects the type of service the impeller is suited for. Neoprene is associated with cooling and general water pumping, while nitrile is used when the water may contain oil or diesel contamination.

• 17935-0001: Material Neoprene. This version suits general marine raw-water cooling and water pumping where oil or diesel exposure is not a normal part of the system.
• 17935-0003: Material Nitrile. This version is used for bilge or transfer duties where the pumped water may carry oil or diesel contamination.

Installation and fit

Before fitting, compare the removed impeller with the replacement for diameter, depth, shaft size, blade count, and spline-drive layout. The vanes should be lubricated before insertion, and the pump cover gasket or sealing surface should be inspected so the pump can prime properly after service.

During installation, rotate the impeller in the normal pump direction while easing the vanes into the housing. After the cover is refitted, check the raw-water flow or discharge flow as soon as the pump is run, then inspect for leaks around the cover plate.

Maintenance and use on board

Flexible impellers are wear items, especially on boats that sit unused, run in silty water, or operate with partially restricted intakes. A planned replacement schedule is safer than waiting for overheating, weak discharge flow, or broken vane pieces in the cooling circuit.

This impeller range is a good match for boat owners maintaining compatible Jabsco flexible impeller pumps and for skippers who want a correctly sized spare in the engine-room parts kit before longer coastal runs, fishing days, or extended cruising.