Description
Mercury 16951T1 Brass Drain Plug for MerCruiser Blocks and Exhaust Manifolds
The Mercury 16951T1 Brass Drain Plug is a machined brass engine block or exhaust manifold drain plug designed for select MerCruiser sterndrive and inboard engines. Featuring a 1/4-inch NPT fitting, this drain plug helps make draining cooling water easier during winterizing, antifreeze changes, and cooling system service.
Key Features
- Mercury Precision brass drain plug
- Part number: 16951T1
- Machined brass engine block or manifold drain plug
- 1/4-inch NPT fitting
- Fits most MerCruiser sterndrive and inboard engine blocks and exhaust manifolds
- Can be used with engines equipped with closed cooling or raw water cooling systems
- Helps make winterizing and antifreeze changes easier
- Easy to install with common tools
- Useful for replacing worn, damaged, corroded, or missing drain plugs
Fitment / Product Details
- Brand: Mercury Precision
- Part Number: 16951T1
- BU Part ID: 16951T1
- Product Type: Brass drain plug / engine block drain plug / manifold drain plug
- Application: MerCruiser engine block and exhaust manifold drain plug applications
- Engine Types: Most MerCruiser sterndrive and inboard engine blocks and manifolds where 16951T1 is specified
- HP Range: Application-specific; match by engine model, manifold type, cooling system, and parts diagram
- Thread Size: 1/4 in NPT
- Material: Machined brass
- Cooling System Compatibility: Closed cooling and raw water cooling systems where specified
- Assembly Location: Engine block or exhaust manifold drain location
- Brand Store Category: Parts
- Brand Store Subcategory: Cooling System
- Country of Origin: US
- Packaged Quantity: 1
- UPC: 745061029156
- Package Dimensions: 5.25 in L x 2.2 in W x 1.65 in H
- Package Weight: 0.113 lb
- Fitment Note: Match part number 16951T1, 1/4-inch NPT thread size, engine block or manifold drain location, cooling system type, owner’s manual, or service manual before ordering.
Expanded Fitment
- MerCruiser Sterndrive Engines: Fits most compatible engine block and exhaust manifold drain applications where 16951T1 is specified
- MerCruiser Inboard Engines: Fits most compatible block and manifold drain plug applications where 16951T1 is specified
- Closed Cooling Systems: Use where a 1/4-inch NPT brass drain plug is specified for draining service
- Raw Water Cooling Systems: Use where a 1/4-inch NPT brass drain plug is specified for draining service
- Other Sterndrive / Inboard Applications: May fit other brands of sterndrive or inboard engines and manifolds where the same 1/4-inch NPT brass drain plug is required
Why You Should Buy
- Correct Mercury brass drain plug for applications requiring 16951T1
- 1/4-inch NPT fitting matches compatible MerCruiser block and manifold drain ports
- Machined brass construction is suited for marine cooling system service
- Helps simplify draining cooling water for winterizing or antifreeze changes
- Useful replacement for worn, damaged, leaking, or corroded drain plugs
- Easy installation with common tools when matched to the correct application
Common Applications
- MerCruiser engine block drain plug replacement
- MerCruiser exhaust manifold drain plug replacement
- Marine engine winterizing service
- Cooling water draining before storage
- Antifreeze change service on compatible engines
- Closed cooling and raw water cooling system maintenance
- Applications requiring Mercury 16951T1
FAQ
- What is Mercury 16951T1? Mercury 16951T1 is a machined brass drain plug for select MerCruiser engine block and exhaust manifold applications.
- What thread size is this drain plug? This drain plug uses a 1/4-inch NPT fitting.
- What material is this plug made from? This drain plug is made from machined brass.
- Where is this drain plug used? It is used in compatible MerCruiser engine block or exhaust manifold drain locations.
- What is this plug used for? It helps drain cooling water for winterizing, antifreeze changes, and cooling system service.
- Does this work with closed cooling systems? Yes. It can be used with compatible engines equipped with closed cooling systems where this plug is specified.
- Does this work with raw water cooling systems? Yes. It can be used with compatible raw water cooling systems where this plug is specified.
- What horsepower range does this fit? The HP range is application-specific. Match by engine model, drain location, thread size, and service manual.
- What is the UPC? The UPC is 745061029156.
- What is the package size? The package measures 5.25 in L x 2.2 in W x 1.65 in H and weighs 0.113 lb.
- How should I confirm fitment? Match part number 16951T1, 1/4-inch NPT thread size, engine block or manifold drain location, cooling system type, owner’s manual, or service manual before ordering.




