19278-ZY3-000 Honda Flush Valve Case | Genuine Used Part

🔧 Product Description

Genuine Honda Flush Valve Case - Part Number: 19278-ZY3-000

A genuine used Honda flush-valve case for selected mid- and high-horsepower four-stroke outboards.

The case forms the fixed body of the freshwater-flushing connection in the mount case. It supports the flush valve, spring, gasket and external cover and routes flushing water into the engine cooling system.

⚙️ Key Features

• Genuine Honda Marine OEM flush-valve case
• Correct Honda part number 19278-ZY3-000
• Forms the body of the external freshwater-flush connection
• Used with cover 19277-ZY3-000ZA
• Accepts the associated flush valve, spring and gasket components

🚤 Compatibility

Commonly used on

• Honda Marine freshwater-flush valve assemblies
• Honda ZY3-family mount-case cooling systems

Typically suits

• Engine models:
• Honda BF200A2 - BAEJ-1000001 to BAEJ-1099999
• Honda BF200A3 - BAEJ-1100001 to BAEJ-1199999
• Honda BF200A4 - BAEJ-1200001 to BAEJ-1299999
• Honda BF200A5 - BAEJ-1300001 to BAEJ-1399999
• Honda BF200A6 - BAEJ-1400001 to BAEJ-1499999
• Honda BF200AK0 - BAEJ-1500001 to BAEJ-1599999
• Honda BF200AK1 - BAEJ-1600001 to BAEJ-1699999
• Honda BF200AK2 - BAEJ-1700001 to BAEJ-1799999
• Honda BF200AK3 - BAEJ / BAFJ-1800001 to 1899999
• Honda BF200D - BBRJ-1000001 and above
• Honda BF225A2 - BAGJ / BAHJ-1000001 to 1099999
• Honda BF225A3 - BAGJ / BAHJ-1100001 to 1199999
• Honda BF225A4 - BAGJ / BAHJ-1200001 to 1299999
• Honda BF225A5 - BAGJ / BAHJ-1300001 to 1399999
• Honda BF225A6 - BAGJ / BAHJ-1400001 to 1499999
• Honda BF225AK0 - BAGJ / BAHJ-1500001 to 1599999
• Honda BF225AK1 - BAGJ / BAHJ-1600001 to 1699999
• Honda BF225AK2 - BAGJ / BAHJ-1700001 to 1799999
• Honda BF225AK3 - BAGJ / BAHJ-1800001 to 1899999
• Honda BF225D - BBPJ-1000001 and above; regional BBPJ-8000001 and above
• Honda BF250D - BBNJ-1000001 and above; regional BBNJ-8000001 and above
• HP Range: 200HP - 250HP
• Engine Type: Honda V6 four-stroke outboard using the ZY3 flush-valve assembly
• Year Range: Approximately 2002 onward

🔌 Function

The case houses the flush-valve components and creates the passage used to introduce freshwater into the cooling system during flushing. It must seal correctly to prevent cooling-water leakage during engine operation.

⚠️ Common Signs of Failure

• Case is cracked or distorted
• Threads or hose-connection surfaces are damaged
• Valve seat is corroded or pitted
• Cooling water leaks from the flush connection
• Flush hose cannot be attached or sealed correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 19278-ZY3-000 current Honda OEM service reference

OEM / Related Numbers

• 19278-ZY3-000
• 19278ZY3000
• 19277-ZY3-000ZA related flush-valve cover
• 19279-ZW9-010 related flush-valve spring
• 19291-ZW9-000 related flush valve
• 19297-ZW9-000 related flush-valve gasket

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated