Mercury 42909A-4 75-115HP 2-Cycle Diaphragm Kit

Mercury 42909A4 Diaphragm Kit for 75-90 HP 3-Cylinder Outboards

The 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.

Product Features:

• Genuine OEM Mercury diaphragm kit
• Fits select Mercury and Mariner 2-cycle outboards
• Designed for compatible 75-90 HP 3-cylinder applications where specified
• Helps replace worn, damaged, or aged diaphragm components
• Direct replacement where part number 42909A4 is specified
• Built to Mercury Marine OEM fit and performance standards

Product Details:

• Brand: Mercury
• Manufacturer Part Number: 42909A4
• Listing Part Number: 42909A-4
• Part Type: Diaphragm Kit
• Application: Select Mercury and Mariner 2-cycle outboards

Fits Select Mercury/Mariner Applications:

• 75 HP 3-cylinder outboards, serial number 9589039 through 9793576
• 75 HP 3-cylinder outboards, serial number 0C222000 through 0D283221
• 90 HP 3-cylinder outboards, serial number 9589039 through 9793576
• 90 HP 3-cylinder outboards, serial number 0C222000 through 0D283221

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.

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