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Add to CartThe Mercury 42909A4 Diaphragm Kit is a genuine OEM replacement kit for select Mercury and Mariner 2-cycle outboards. This kit is used where part number 42909A4 is specified by the Mercury parts diagram or service manual.
Designed for compatible 75-90 HP 3-cylinder outboard applications, this diaphragm kit helps replace worn, damaged, or aged diaphragm components during service or repair. Always verify your engine model and serial number before ordering.
Service Note: See your owner’s manual or service manual for specific application details, diaphragm replacement instructions, gasket placement, and system inspection procedures for your outboard.
Fitment Note: Diaphragm kit fitment should be verified by outboard model, horsepower, cylinder count, serial number, system location, parts diagram, and existing part number before ordering. Please confirm this diaphragm kit is correct for your Mercury or Mariner 2-cycle outboard before purchasing.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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