91301-ZW4-003 Honda Marine O-Ring 6.9x1.45mm | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Gearcase Drain / Vent Screw O-Ring 6.9 × 1.45 mm - Part Number: 91301-ZW4-003

A genuine Honda 6.9 × 1.45 mm O-ring used on specified lower-unit drain and vent screws. It seals the screw against gear-lubricant leakage and water entry and should be renewed whenever the screw is removed.

⚙️ Key Features

• Genuine Honda gearcase screw O-ring
• Nominal dimensions: 6.9 × 1.45 mm
• Oil-, water- and compression-resistant elastomer
• Single-use service seal for gear-oil changes

🚤 Compatibility

Commonly used on

• Honda BF8D/BF9.9D/BF15D/BF20D
• Honda BF25D/BF30D/BF40D/BF50D/BF60A/BFP60A
• Honda BF75D/BF90D/BF100A
• Honda BF115A/BF115D/BF130A/BF135A/BF150A
• Honda BF175A/BF200A/BF225A/BF250A and later D-series gearcases where the drain/vent screw diagram lists 91301-ZW4-003

Typically suits

• HP Range: 8-250 HP across verified gearcase applications
• Engine Type: Honda outboard lower-unit drain/vent screw
• Year Range: Principally 2005 onward, model dependent
• Serial / Identification Range: Fitment is controlled by the drain/vent screw design. Confirm the gearcase diagram and 6.9 × 1.45 mm O-ring specification.

🔌 Function

Seals the drain or vent screw so gear lubricant remains contained and water cannot enter.

⚠️ Common Signs of Failure

• Gear oil seeps from the screw
• Milky lower-unit lubricant
• O-ring is cut, flattened, swollen or missing
• Drain or vent screw has been removed for servicing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 91301-ZW4-003 - current verified Honda service reference
• No later direct Honda supersession confirmed

OEM / Related Numbers

• 91301-ZW4-003
• 91301ZW4003

Aftermarket / Verified Equivalents

• FridayParts-compatible replacement O-ring sets reference 91301-ZW4-003
• Material and exact dimensions must be confirmed before substitution

📦 Condition

• Genuine Honda Marine OEM part
• Brand new
• Supplied in genuine Honda or equivalent protective packaging