817519A2 Mercury Check Valve | Genuine Used Part

🔧 Product Description

Genuine Mercury Drain Check Valve Assembly - Part Number: 817519A2

A genuine Mercury one-way drain check valve used in selected bottom-cowling and hydraulic power-steering pump assemblies.

The valve permits collected water or fluid to drain from the enclosure while resisting reverse flow into the cowling or pump housing.

⚙️ Key Features

• Genuine Mercury Marine check valve
• Correct part number 817519A2
• One-way drain-valve operation
• Used in bottom-cowling drain systems
• Also used in selected Mercury power-steering pump enclosures

🚤 Compatibility

Commonly used on

• Mercury bottom-cowling drain systems
• Mercury and Verado hydraulic steering-pump drain assemblies

Typically suits

• Engine models:
• Mercury 65 Jet
• Mercury 75HP three-cylinder
• Mercury 75HP four-stroke
• Mercury 75HP DFI
• Mercury 80 Jet
• Mercury 80HP EFI four-stroke
• Mercury 90HP three-cylinder
• Mercury 90HP four-stroke and EFI four-stroke
• Mercury 90HP DFI
• Mercury 100HP four-cylinder and EFI four-stroke
• Mercury 115HP four-cylinder
• Mercury 125HP four-cylinder and DFI
• Mercury Verado power-steering pump assemblies from 200HP to 400HP where 817519A2 is specified
• HP Range: 65HP - 400HP, dependent on installation
• Engine Type: Mercury two-stroke, DFI and four-stroke outboard; Verado steering system
• Year Range: Approximately 1990s onward, dependent on application

🔌 Function

The valve allows fluid to exit through the designated drain while preventing spray or fluid from flowing backwards into the protected enclosure.

⚠️ Common Signs of Failure

• Water remains trapped in the bottom cowling
• Valve is blocked with salt or debris
• Reverse leakage occurs through the drain
• Rubber valve section is hardened or split
• Drain tubing repeatedly fills or overflows

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 817519A2 current OEM check-valve assembly reference

OEM / Related Numbers

• 817519A2
• 21-817519A2
• 745061322332
• Related drain tubing and bottom-cowling fittings

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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