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Flexible Rubber Water Pump Impeller 18948-0001 – 12 Blade Neoprene 65 mm Key Drive – Fits Johnson 09-702B-1

Vendor: JLM Marine
Availability: In Stock
Product Type: Flexible Rubber Impeller
$34.80
$34.80
Subtotal: $34.80

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Flexible Rubber Water Pump Impeller 18948-0001 – 12 Blade Neoprene 65 mm Key Drive – Fits Johnson 09-702B-1

Flexible Rubber Water Pump Impeller 18948-0001 – 12 Blade Neoprene 65 mm Key Drive – Fits Johnson 09-702B-1

$34.80

How to Match This Part

This is a flexible rubber raw water pump impeller. It sits inside the pump housing behind the cover plate and is driven by a keyed shaft. It replaces the primary original part number Jabsco 18948-0001, and is also supplied against Johnson 09-702B-1, JMP 7300-01, DJ 08-20-1201 and Sherwood 10615.

Match this part by checking your engine in this order:
1. Original impeller part number (stamped on the old impeller or listed in the pump section of your parts catalog)
2. Width (this listing is 41.5 mm thick, not the 37 mm 8-blade 11979-0001)
3. Drive type (this listing is a key-drive hub, not a spline)
4. Pump model (cast or labelled on the pump body)

Identify it physically before ordering. This impeller has twelve vanes moulded in black neoprene around a machined brass key-drive insert. JMP 7300-01 is 65 mm diameter, 41.5 mm width and 15.8 mm (5/8 in.) bore. It is not interchangeable with 8-blade spline Jabsco 11979-0001 (65 × 37 mm) or with 12-blade 57 mm Jabsco 1210-0001 / JMP 7110-01 (57 × 20 mm key).

  • ✓ Primary OEM: Jabsco 18948-0001
  • ✓ Product form: 12-blade neoprene impeller, brass key-drive insert, 41.5 mm width
  • ✓ Fitment: part number, then width, then drive type

Part Number Cross-Reference

Use this table to confirm equivalent part numbers. JMP 7300-01K and Sherwood 10615K are kit numbers. This listing is the impeller only.

Type Brand Part Number Notes
OEM Jabsco Pump 18948-0001 Primary reference
OEM Johnson Pump (SPX Flow) 09-702B-1 Key-drive 12-blade impeller
OEM JMP Pump 7300-01 Bare impeller. JMP 7300-01K is a kit
OEM DJ Pump 08-20-1201 12-blade key-drive equivalent
OEM Sherwood Pump 10615 Bare impeller
OEM Sherwood Pump 10615K Source-sheet kit number. This listing does not include gasket or O-ring
OEM Yanmar 128170-02070 Match this number. Do not dump 3JH / 4JH families
OEM Cummins / Onan 3908220, 0132-0348, 0132-0499, 835874 Source-sheet numbers. JMP lists 835874 as Volvo Penta equivalent
OEM Cummins Onan 0132-0292, 132-0348, 132-0349, 132-0499, 0541-1316, 541-1521, 0541-1521 JMP 7300-01 equivalent list. Match the original number
OEM Perkins NA900012 Source-sheet number (also written 900012 on JMP)
Other brand Industry interchange J-1105 Source-sheet other-brand number
Other brand Industry interchange 888-1105 Source-sheet other-brand number for this SKU

Compatible Engine Models

Confirm the original impeller number and the 12-blade 41.5 mm key-drive hub. Do not assume every Onan MDK generator or Cummins 4B/6B uses this part.

Brand Engine / Pump Model Original Part No. Notes
Jabsco / Johnson / Sherwood Pumps specified for 18948-0001, 09-702B-1 or 10615 18948-0001, 09-702B-1, 10615 12-blade, key drive, 65 × 41.5 × 15.8 mm
Yanmar Engines whose parts list calls for 128170-02070 128170-02070 Match the original number
Cummins Onan Generators whose parts list calls for 132-0348 / 132-0349 / 132-0499 / 541-1521 132-0348, 132-0349, 132-0499, 541-1521 Match the original number. Do not dump MDK families
Perkins / Volvo Penta Engines whose parts list calls for NA900012 or 835874 NA900012, 835874 Match the original number. Do not dump AQ families

Technical Specifications

Specification Value
Part type Flexible rubber impeller, raw water pump
Number of blades 12
Impeller diameter (A) 65 mm (2-9/16 in.)
Impeller width / depth (B) 41.5 mm (1-5/8 in.)
Shaft bore diameter (C) 15.8 mm (5/8 in.)
Insert / drive type Key drive
Insert material Machined brass
Vane material Neoprene rubber

Package Contents

This listing is for the impeller only, as shown in the product images. Please refer to the part number cross-reference table to confirm component details.

Cover plate gaskets, O-rings and lubricant are not included. JMP 7300-01K and Sherwood 10615K add those service parts. If your service procedure calls for a new cover seal, order it separately against your pump model.

Installation Guide

  1. 1 Stop the engine, let it cool, and close the raw water seacock so water cannot enter the boat while the pump is open.
  2. 2 Remove the cover plate screws and lift off the cover. Keep the screws and the old gasket together so you can compare the seal size when reassembling.
  3. 3 Note the key orientation, then grip the brass insert and pull the old impeller straight off. Recover any broken vane pieces from the downstream cooling circuit before continuing.
  4. 4 Clean the housing bore and the wear plate, and inspect them for scoring. Apply a marine-grade impeller lubricant, glycerine or soapy water to the bore and the new vanes. Do not use petroleum-based grease, which attacks neoprene.
  5. 5 Align the keyway in the brass insert with the pump shaft key, then press the impeller in while turning the shaft in the normal direction of rotation so all twelve vanes lay over the same way.
  6. 6 Refit the cover plate with a serviceable gasket, tighten the screws evenly in a crisscross pattern, open the seacock, then start the engine and confirm a solid stream of cooling water and no leaks at the cover.

Note: Professional installation is recommended to ensure safety and optimal performance.

Troubleshooting & FAQ

How do I confirm this fits my engine? +

Start from the original impeller number. If the old part is Jabsco 18948-0001, Johnson 09-702B-1, JMP 7300-01, DJ 08-20-1201, Sherwood 10615, Yanmar 128170-02070, Perkins NA900012 or the Onan numbers in the table, and the brass hub is a key drive about 41.5 mm wide on a 65 mm 12-blade impeller, this part is the correct size.

Is this the same as Jabsco 11979-0001 / JMP 7200-01? +

No. 11979-0001 is an 8-blade 12-spline impeller, 65 × 37 mm. This listing is 12-blade key drive, 65 × 41.5 mm.

Will this fit every Onan MDK generator or Cummins 4B? +

No. Only engines whose parts list calls for 18948-0001, 09-702B-1, 132-0348, 132-0349, 132-0499, 541-1521 or the other verified numbers. Match the original number and measure the old impeller width.

What are the signs that my impeller needs replacing? +

The usual symptoms are a weak or intermittent stream of cooling water, rising engine temperature, and vanes that are cracked, flattened, hardened or missing on inspection. Flexible impellers are a wear item; inspect on a fixed service interval rather than waiting for failure.

Is this a kit or just the impeller? +

This listing is the impeller only. JMP 7300-01K and Sherwood 10615K are kit numbers that add gaskets, O-rings and lubricant.

Is this an OEM or aftermarket part? +

This listing is an aftermarket replacement part and is not an OEM component. We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost? +

We offer fast global shipping, typically 5–15 days worldwide, and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy? +

This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window for unused items in original condition; please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist, even if your model is listed, do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • The impeller is supplied on its own. Cover seals and lubricant must be ordered separately if your service procedure requires them.
  • This is a 12-blade, 65 mm key-drive impeller, 41.5 mm wide. It will not fit 8-blade spline 11979-0001 or 57 mm JMP 7110-01.
  • Never run the pump dry. Even a few seconds without water will damage the neoprene vanes.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.

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Для наших типичных клиентов из США и Канады сроки доставки следующие:

  • Amazon FBA : заказы будут доставлены в течение 1–5 рабочих дней после размещения заказа (в определенные особые периоды, такие как крупные акции, Рождество и т. д., время доставки Amazon FBA может быть изменено).
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Основанная в 2002 году, компания JLM Marine зарекомендовала себя как специализированный производитель высококачественных морских деталей, базирующийся в Китае. Наша приверженность совершенству в производстве заслужила нам доверие ведущих мировых морских брендов.

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Мы рады расширить свое присутствие через розничные каналы, предлагая наш опыт и приверженность качеству непосредственно владельцам и любителям лодок по всему миру.

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