6E5-45378-00 Yamaha Fitting | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Lower-Unit Pitot Speedometer Hose Nipple - Part Number: 6E5-45378-00

A genuine Yamaha threaded hose nipple for the lower-unit pitot speedometer system.

The fitting screws into the gearcase and connects the internal pitot-water passage to the small hose leading to the boat speedometer. Water pressure generated as the boat moves is transmitted through the hose to operate the gauge.

⚙️ Key Features

• Genuine Yamaha OEM pitot hose fitting

• Correct Yamaha part number 6E5-45378-00

• M10 x 1.0 threaded connection

• Barbed outlet for the factory speedometer hose

• Direct aftermarket replacement fittings available

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 6E5-45378-00 current OEM pitot hose-nipple reference

OEM / Related Numbers:

• 6E5-45378-00

• 6E5-45378-00-00

• Pitot hose nipple

• Lower-unit speedometer fitting

• M10 x 1.0 to hose-barb adapter

Aftermarket / Verified Equivalents:

• Aftermarket M10 x 1.0 pitot hose connector: 6E5-45378-00 replacement

• QuickMarine-style lower-unit speedometer fitting

• Generic Yamaha pitot hose nipple: 6E5-45378-00

🚤 Compatibility

Commonly used on:

• Yamaha lower-unit pitot speedometer systems

• Gearcases with an internal water-pressure speed pickup

Typically suits:

• Engine models:

• Yamaha 115HP two-stroke - approximately 1984-1999

• Yamaha 130HP two-stroke

• Yamaha 150HP two-stroke

• Yamaha 175HP two-stroke

• Yamaha 200HP two-stroke

• Yamaha 220HP two-stroke

• Yamaha 225HP two-stroke

• Yamaha 115ETLN through 115TJRX production

• Selected Yamaha 30HP to 90HP gearcases using the same pitot fitting

• Yamaha lower units whose speedometer diagram specifies 6E5-45378-00

• HP Range: Approximately 30HP - 225HP

• Engine Type: Yamaha two-stroke and selected four-stroke outboard

• Year Range: Approximately 1984 onward, dependent on lower-unit casting

🔌 Function

The fitting transfers dynamic water pressure from the lower-unit pitot opening to the mechanical boat speedometer hose.

Common signs of failure:

• Speedometer remains at zero while underway

• Speed reading is low or erratic

• Water leaks around the fitting

• Hose repeatedly disconnects from the barb

• Fitting is blocked by sand, mud or marine growth

📦 Condition

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging