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MG Duff CM34127Z Mercury 34127T2 / 34127A1 Long Skeg Trim Tab Zinc Anode 127 mm
The MG Duff CM34127Z is a zinc sacrificial long skeg trim tab anode designed for compatible Mercury outboard and MerCruiser sterndrive installations. It replaces Mercury OEM part numbers 34127T2 and 34127A1.
The anode features a long skeg-style trim tab configuration and is listed for MerCruiser 80–140 HP applications. Manufactured from zinc, it provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the propulsion system.
The CM34127Z measures 89 mm in outside diameter and 127 mm in height. It has a specified 7/16-14 UNC mounting thread size, one fixing hole and weighs 0.59 kg (590 g).
Technical Specifications
Parameter Specification Manufacturer MG Duff Manufacturer Part Number CM34127Z Product Type Long Skeg Trim Tab Sacrificial Anode Material Zinc Compatible Manufacturers Mercury / MerCruiser Application Mercury Outboard / MerCruiser Sterndrive Listed Power Range 80–140 HP (MerCruiser) Mercury OEM References 34127T2, 34127A1 Outside Diameter 89 mm Height 127 mm Thread Specification 7/16-14 UNC Number of Fixing Holes 1 Weight 0.59 kg (590 g) Sales Unit 1 piece
Mercury and MerCruiser Compatibility
The MG Duff CM34127Z is listed for compatible Mercury outboard and MerCruiser sterndrive installations requiring a long skeg trim tab anode corresponding to:
- Mercury 34127T2
- Mercury 34127A1
The supplied application information also identifies MerCruiser 80–140 HP.
Specific outboard models, sterndrive generations and production years have not been provided. Before ordering, confirm the original part number and mounting configuration against the appropriate Mercury or MerCruiser parts documentation.
Long Skeg Trim Tab Construction
The CM34127Z features a long skeg-style trim tab body intended for the corresponding lower-unit mounting position.
Its confirmed specifications include:
- Outside diameter: 89 mm
- Overall height: 127 mm
- Mounting thread specification: 7/16-14 UNC
- Fixing holes: 1
- Weight: 0.59 kg
The long skeg configuration is important when selecting a replacement, as the original trim tab shape, mounting arrangement and thread specification must match the new component.
Zinc Sacrificial Corrosion Protection
The CM34127Z is manufactured from zinc, a sacrificial anode material commonly used for galvanic corrosion protection in saltwater marine environments.
When correctly installed with suitable electrical continuity to metallic components requiring protection, the zinc corrodes preferentially, helping reduce galvanic corrosion of electrically connected underwater components.
The suitability of zinc should be confirmed according to the vessel's operating water conditions and the propulsion equipment manufacturer's recommendations.
Inspection and Replacement
Inspect the long skeg trim tab anode periodically during routine outboard or sterndrive maintenance. Replace it when the zinc material becomes significantly depleted, damaged or no longer securely attached.
Before installation, check the original trim tab configuration and verify the 7/16-14 UNC mounting thread specification. Follow the applicable Mercury or MerCruiser maintenance instructions.
Part Numbers and Cross-References
- MG Duff: CM34127Z
- Mercury OEM: 34127T2
- Mercury OEM: 34127A1
- Material: Zinc
- Application: Long Skeg Trim Tab
Scope of Supply
1 × MG Duff CM34127Z Mercury / MerCruiser Zinc Long Skeg Trim Tab Anode.
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