OEM Quicksilver Mercury/Mariner & MerCruiser Poppet-Valve Diaphragm – 648771
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🛡️ PARTSDUCK Promise - Best price, great support & more
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Description
Description
Quicksilver 648771 is a replacement poppet-valve diaphragm for specified Mercury, Mariner and MerCruiser cooling systems.
Product details
- Manufacturer part number: 648771.
- Manufacturer-listed applications include select Mercury and Mariner 75–250 hp two-stroke and four-stroke outboards, L6 Verado and specified MerCruiser inboards.
- Replacement diaphragm for the specified poppet-valve assembly.
- Other components needed for service are sold separately.
Fitment and selection
Confirm 648771 in the engine serial-number parts listing. Horsepower alone is not sufficient to determine the correct poppet-valve diaphragm.

