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![Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/70615XL.jpg?v=1591347459)
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Ships within 48 hours · Estimated delivery Oct 14 - Oct 19
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Description
Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]Series 40 Ball Bearing Block Single Upright Lead Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on Acetal or Torlon ball bearings provide high performance & low friction. The 2 stage ball bearing system provides consistent performance over the full load range. Applications: Typically used for halyards at the mast base. Materials: Acetal ball
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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![Maxwell Seal Kit f/Freedom Series 1000 1500 Rope/Chain Windlasses [P90006]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/70228XL.jpg?v=1591346268)
Best in 7 days
4.3 ★★★★★
Based on 2147 reviews
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Product Reviews
★★★★★ 5
Fit perfectly and very complete set of parts
Had everything I needed plus some extra parts in the kit. I probably could have just replaced the impeller for slightly less but while everything was disassembled you might as well replace the works. Included - Water Pump Impeller, Housing, Key, Face Plate, Face Plate Gasket, O-Ring, Seal Face and Carrier Assembly Oil Seal
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Reviewed in the United States on October 28, 2025
★★★★★ 5
Water impeller kit
Worked perfectly for my ‘02 Rinker Captiva 212 with the 5.7 Mercruiser Aloha one outdrive !
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Reviewed in the United States on October 9, 2025
★★★★★ 4
Good quality, but could have used better instructions
The kit was complete, and all the components were well made. However, if you aren't somewhat mechanical, it would be fairly easy to install the gaskets and backing plate in the wrong sequence. With better instructions, this would be a 5 star plus kit.
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Reviewed in the United States on July 31, 2025
★★★★★ 5
Don't pay boat shops for over priced services!
Boat shop wanted $400 dollars for a new water pump replacement. Got this on Amazon and watched a few utube videos. Took less then 2hrs to take apart and replace. I put it in a Alpha 1 gen 2 lower. Very simple process.
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Reviewed in the United States on May 24, 2025
★★★★★ 5
Exact Replacement Plus a Few Extra Parts Dependent on the Model of Outboard
Worked great for my 2005 200hp Optimax Outboard.
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Reviewed in the United States on September 20, 2025
