19251-ZW1-900 Water Tube | Genuine Used Part

🔧 Product Description

Genuine Honda Long Water Tube - Part Number: 19251-ZW1-900

A genuine Honda long cooling-water tube for selected BF75, BF90, BF115 and BF130 four-stroke outboards.

The approximately 14-inch tube carries pressurised cooling water upward from the lower-unit water pump to the powerhead and cooling passages. Correct seating at both ends is essential for maintaining engine cooling-water pressure.

⚙️ Key Features

• Genuine Honda OEM long water tube
• Correct Honda part number 19251-ZW1-900
• Approximately 14 inches in length
• Transfers water from the lower-unit pump to the powerhead
• Used on selected 75HP to 130HP Honda four-stroke outboards

🚤 Compatibility

Commonly used on

• Honda ZW1 and ZW5 extension-case cooling-water systems
• Long-shaft and extra-long-shaft midsection assemblies

Typically suits

• Engine models:
• Honda BF75A
• Honda BF75AT
• Honda BF90A
• Honda BF90AT
• Honda BF115A
• Honda BF115A1
• Honda BF115A2
• Honda BF115A3
• Honda BF115A4
• Honda BF115A5
• Honda BF115A6
• Honda BF115AK0
• Honda BF130A
• Honda BF130A1
• Honda BF130A2
• Honda BF130A3
• Honda BF130A4
• HP Range: 75HP - 130HP
• Engine Type: Honda inline four-cylinder four-stroke outboard
• Year Range: Approximately 1997 - 2007

🔌 Function

The tube carries cooling water from the impeller pump in the gearcase to the engine block and cylinder-head cooling passages.

⚠️ Common Signs of Failure

• Engine overheats despite a serviceable impeller
• Weak cooling-water flow
• Tube corroded, cracked or perforated
• Tube end damaged and unable to seal
• Tube misaligned during lower-unit installation

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 19251-ZW1-900 current documented Honda long water-tube reference

OEM / Related Numbers

• 19251-ZW1-900
• 19251ZW1900
• 19241-ZW1-B02 related water-pump housing
• 19242-ZW1-B00 related water-pump gasket
• Related upper and lower water-tube seals
• Related extension-case water-pipe components

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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