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Flexible Rubber Water Pump Impeller 18838-0001 – 12 Blade Neoprene 62.5 mm Key Drive – Fits Johnson 09-701B-1
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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 18838-0001, and is also supplied against Johnson 09-701B-1, JMP 7192-01, DJ 08-38-1201 and Sherwood 09959.
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 32 mm thick, not the 22.4 mm JMP 7172-01)
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 7192-01 is 62.5 mm diameter, 32 mm width and 16 mm (5/8 in.) bore. Jabsco 18838-0001 is Profile W. It is not interchangeable with JMP 7172-01 (same diameter, 22.4 mm width) or with 57 mm Jabsco 1210-0001 / 4568-0001.
- ✓ Primary OEM: Jabsco 18838-0001
- ✓ Product form: 12-blade neoprene impeller, brass key-drive insert, 32 mm width
- ✓ Fitment: part number, then width, then drive type
Part Number Cross-Reference
Use this table to confirm equivalent part numbers. Jabsco 18838-0001-P, JMP 7192-01K and Sherwood 09959K are kit numbers. This listing is the impeller only.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Jabsco Pump | 18838-0001 | Primary reference. Profile W. 18838-0001-P is the kit number |
| OEM | Johnson Pump (SPX Flow) | 09-701B-1 | Key-drive 12-blade impeller |
| OEM | JMP Pump | 7192-01 | Bare impeller. JMP 7192-01K is a kit |
| OEM | DJ Pump | 08-38-1201 | 12-blade key-drive equivalent |
| OEM | Sherwood Pump | 09959 | Bare impeller. Also written 9959 |
| OEM | Sherwood Pump | 09959K | Source-sheet kit number. This listing does not include gasket or O-ring |
| OEM | Cummins Onan | 132-0117 / 132-0317 | JMP 7192-01 equivalent |
| OEM | Perkins | NA900010 | Source-sheet number. Also listed on Jabsco 18838-0001-P cross-ref |
| Other brand | Industry interchange | J-203B | Source-sheet other-brand number |
| Other brand | Industry interchange | 888-203B | Source-sheet other-brand number for this SKU |
Compatible Engine Models
Confirm the original impeller number and the 32 mm key-drive hub. Do not assume every Onan generator or Volvo Penta AQ uses this part. Match the original number first.
| Brand | Engine / Pump Model | Original Part No. | Notes |
|---|---|---|---|
| Jabsco / Johnson / Sherwood | Pumps specified for 18838-0001, 09-701B-1 or 09959 | 18838-0001, 09-701B-1, 09959 | 12-blade, key drive, 62.5 × 32 × 16 mm |
| Cummins Onan | Generators whose parts list calls for 132-0117 or 132-0317 | 132-0117, 132-0317 | Match the original number |
| Perkins | Engines whose parts list calls for NA900010 | NA900010 | Match the original number |
| Volvo Penta / Westerbeke | Pumps specified for 835512 / 3854286 or 33104 / 11907 | 835512, 3854286, 33104, 11907 | JMP 7192-01 equivalent list. Confirm the original number; do not dump AQ or BED families |
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Flexible rubber impeller, raw water pump |
| Number of blades | 12 |
| Impeller diameter (A) | 62.5 mm (2-7/16 in.) |
| Impeller width / depth (B) | 32 mm (1-1/4 in.) |
| Shaft bore diameter (C) | 16 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. Jabsco 18838-0001-P, JMP 7192-01K and Sherwood 09959K add those service parts. If your service procedure calls for a new cover seal, order it separately against your pump model.
Installation Guide
- 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 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 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 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 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 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
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 32 mm wide, 62.5 mm key-drive impeller. It will not fit JMP 7172-01 (22.4 mm) or 57 mm Jabsco 1210-0001 / 4568-0001.
- 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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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