OEM Quicksilver MerCruiser Molded Cooling & Bypass Hose – 99520
- Ships same or next business day while supplies last.
🛡️ PARTSDUCK Promise - Best price, great support & more
🛡️ PARTSDUCK Promise - Best price, great support & more
More than just a price match! Best price, fast shipping, great stock, real support. More Here
Free Shipping Over $99
Free Shipping Over $99
In stock items ship same or next business day from the closest of our 20+ warehouses with stock. Economy Shipping is free over $99.
Phone Support (856) 666-7986
Phone Support (856) 666-7986
Call us with questions 9-5 Monday - Friday EST.
(856) 666-7986
No Fee Returns for 30 Days
No Fee Returns for 30 Days
No restocking fees on most items, full Return Policy
Description
Description
Quicksilver 99520 is a molded hose used in specified MerCruiser cooling-system connections.
Product details
- Manufacturer part number: 99520.
- Cataloged for water-pump-to-intake-manifold bypass connections in applicable assemblies.
- Also appears in specified heat-exchanger connections.
- Catalog replacement for 66206 in the applicable bypass assembly.
Fitment and selection
Confirm the hose position and engine serial number. In heat-exchanger diagrams, tube diameters and hose versions vary; match the exact catalog callout.

