Yamaha - Hose Nipple - Cooling System Hose Connector - 6E5-45378-00-00

Overview

On older Yamaha outboards, little fittings like this can be the difference between a clean cooling system service and a leak that keeps coming back. This Yamaha Hose Nipple provides the threaded connection point that lets cooling hoses seat properly and keep water moving where it belongs. When these fittings corrode, clog, or get damaged during teardown, replacing them with the right OEM part saves a lot of headaches. It is a small piece, but it matters when you want the motor buttoned up right and ready for the next run.

Key Features

• Cooling Hose Connection – Provides a secure threaded attachment point for cooling system hose routing.
• OEM Yamaha Fit – Built to Yamaha specifications for proper thread engagement and dependable sealing.
• Corrosion-Resistant Design – Made to handle the heat, moisture, and salt exposure common in marine use.
• Smart Service Replacement – Ideal to replace during cooling system repairs when old fittings are worn or damaged.

Engine & Boat Compatibility

• 25 - 1997-2002
• 30 - 1987-2002
• 40 - 1984-2005
• 50 - 1984-2005
• 60 - 2001-2005
• 70 - 1984-2005
• 90 - 1984-2005
• 115 - 1984-2005
• 130 - 1988-2004
• 150 - 1984-2005
• 175 - 1984-2000
• 200 - 1984-1998
• 225 - 1990-1997
• B90 - 1997-1999
• B115 - 1998-1999
• C30 - 1995
• C40 - 1997-2003
• C50 - 1998-2001
• C60 - 1996-2001
• C70 - 2000-2001
• C75 - 1998-1999
• C80 - 1997
• C90 - 1997-2001
• C115 - 1991-2000
• C150 - 1996-1999
• D150 - 1997-1999
• DX150 - 1999-2005
• F30 - 2001-Current
• F40 - 2000-Current
• F50 - 1995-Current
• F60 - 2002-Current
• F70 - 2010-Current
• F75 - 2003-Current
• F80 - 1999-2003
• F90 - 2003-Current
• F100 - 1999-2003
• F115 - 2000-Current
• L130 - 1989-2000
• L150 - 1987-1995
• L200 - 1987-1995
• LF115 - 2000-Current
• P40 - 1998
• P50 - 1995-1996
• P60 - 1991-1999
• P75 - 1996-1999
• PRO50 - 1987
• PROV150 - 1986-1990
• PX150 - 1999
• S115 - 1996-1999
• S130 - 1996-1999
• S150 - 1996-1999
• S175 - 1996-1999
• S200 - 1996-1999
• SX150 - 1999-2004
• SX200 - 1999-2005
• T25 - 2001-Current
• T50 - 1996-Current
• T60 - 2003-Current
• V150 - 2000-2005
• V175 - 2000
• VF115 - 2015
• VX150 - 2000-2004
• VZ150 - 2000-Current
• VZ175 - 2001-Current
• VZ200 - 2001-2004
• Z150 - 2000-2005
• Z175 - 2001-2005
• Z200 - 2000-2012

Frequently Asked Questions

Q: What does a hose nipple do on a Yamaha outboard?
A: It gives the cooling hose a proper threaded connection point so water can move through the system without leaks.

Q: What are signs this part should be replaced?
A: Corroded threads, blockage, seepage around the fitting, or a damaged hose connection are all common signs.

Q: Does saltwater use wear fittings like this out faster?
A: Yes. Salt, heat, and moisture can slowly corrode small fittings over time, especially on older engines.

Q: Is this an easy service item to replace?
A: In many cases it is straightforward, especially when the surrounding cooling components are already apart for maintenance.

Q: Should I inspect these fittings during cooling system service?
A: Absolutely. It is a smart time to check for corrosion, cracking, or restricted flow before everything goes back together.

• Engine Application
  • 25 - 1997-2002
  • 30 - 1987-2002
  • 40 - 1984-2005
  • 50 - 1984-2005
  • 60 - 2001-2005
  • 70 - 1984-2005
  • 90 - 1984-2005
  • 115 - 1984-2005
  • 130 - 1988-2004
  • 150 - 1984-2005
  • 175 - 1984-2000
  • 200 - 1984-1998
  • 225 - 1990-1997
  • B90 - 1997-1999
  • B115 - 1998-1999
  • C30 - 1995
  • C40 - 1997-2003
  • C50 - 1998-2001
  • C60 - 1996-2001
  • C70 - 2000-2001
  • C75 - 1998-1999
  • C80 - 1997
  • C90 - 1997-2001
  • C115 - 1991-2000
  • C150 - 1996-1999
  • D150 - 1997-1999
  • DX150 - 1999-2005
  • F30 - 2001-Current
  • F40 - 2000-Current
  • F50 - 1995-Current
  • F60 - 2002-Current
  • F70 - 2010-Current
  • F75 - 2003-Current
  • F80 - 1999-2003
  • F90 - 2003-Current
  • F100 - 1999-2003
  • F115 - 2000-Current
  • L130 - 1989-2000
  • L150 - 1987-1995
  • L200 - 1987-1995
  • LF115 - 2000-Current
  • P40 - 1998
  • P50 - 1995-1996
  • P60 - 1991-1999
  • P75 - 1996-1999
  • PRO50 - 1987
  • PROV150 - 1986-1990
  • PX150 - 1999
  • S115 - 1996-1999
  • S130 - 1996-1999
  • S150 - 1996-1999
  • S175 - 1996-1999
  • S200 - 1996-1999
  • SX150 - 1999-2004
  • SX200 - 1999-2005
  • T25 - 2001-Current
  • T50 - 1996-Current
  • T60 - 2003-Current
  • V150 - 2000-2005
  • V175 - 2000
  • VF115 - 2015
  • VX150 - 2000-2004
  • VZ150 - 2000-Current
  • VZ175 - 2001-Current
  • VZ200 - 2001-2004
  • Z150 - 2000-2005
  • Z175 - 2001-2005
  • Z200 - 2000-2012