Yamaha - Hose Nipple - Cooling System Hose Connector - 63P-45378-00-00

Overview

Small fittings like this are easy to overlook, but they play an important role in keeping water moving through a Yamaha outboard’s cooling system. This Yamaha Hose Nipple provides a secure connection point for cooling hoses so water flows where it’s supposed to without leaks or restrictions. When one gets corroded, clogged, or damaged during service, it’s best to replace it with the correct OEM piece. It’s a simple part, but when you’re rigging or servicing engines regularly, having the right fitting makes the job go smoothly.

Key Features

• Secure Hose Connection – Provides a reliable connection point for cooling system hoses to maintain proper water flow.
• Corrosion-Resistant Construction – Built to handle the harsh marine environment where salt, heat, and moisture are constant.
• OEM Yamaha Fitment – Manufactured to Yamaha specifications for proper thread engagement and sealing.
• Ideal for Service Repairs – Commonly replaced when servicing cooling system components or repairing damaged fittings.

Engine & Boat Compatibility

• F150 - 2004-Current
• F175 - 2014-Current
• F200 - 2013-Current
• F225 - 2010-Current
• F250 - 2010-Current
• F300 - 2010-Current
• FL150 - 2010
• FL250 - 2010
• FL300 - 2010-Current
• LF150 - 2004-Current
• LF200 - 2013-Current
• LF225 - 2010-Current
• LF250 - 2010-Current
• LF300 - 2010-Current
• VF150 - 2014-Current
• VF175 - 2015-Current
• VF200 - 2013-Current
• VF225 - 2013-Current
• VF250 - 2013-Current

Frequently Asked Questions

Q: What does a hose nipple do on an outboard engine?
A: It serves as a threaded fitting that allows cooling hoses to connect securely to the engine or cooling passages.

Q: What are signs this fitting needs to be replaced?
A: Corrosion, stripped threads, leaking hose connections, or blockage from debris are common signs it should be replaced.

Q: Can corrosion affect small fittings like this?
A: Yes. Saltwater environments can gradually corrode fittings, which is why they’re often inspected during cooling system service.

Q: Is replacing a hose nipple a complicated repair?
A: Most installations are straightforward, especially when the surrounding components are already accessible during maintenance.

Q: Should hose fittings be checked during routine service?
A: Yes. When cooling hoses are removed for service, it’s a good time to inspect fittings for corrosion or damage.

• Engine Application
  • F150 - 2004-Current
  • F175 - 2014-Current
  • F200 - 2013-Current
  • F225 - 2010-Current
  • F250 - 2010-Current
  • F300 - 2010-Current
  • FL150 - 2010
  • FL250 - 2010
  • FL300 - 2010-Current
  • LF150 - 2004-Current
  • LF200 - 2013-Current
  • LF225 - 2010-Current
  • LF250 - 2010-Current
  • LF300 - 2010-Current
  • VF150 - 2014-Current
  • VF175 - 2015-Current
  • VF200 - 2013-Current
  • VF225 - 2013-Current
  • VF250 - 2013-Current