The Sierra 18-4456 Exhaust Protector Valve is interchangeable with the following: GLM 89240, Mallory 9-44000, Mercruiser 34765A2, 34765A1. Each Sierra product meets or exceeds the original equipment part it replaces.

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Product Review

The Sierra 18-4456 Exhaust Protector Valve is interchangeable with the following: GLM 89240, Mallory 9-44000, Mercruiser 34765A2, 34765A1. Each Sierra product meets or exceeds the original equipment part it replaces.

  • Sierra Exhaust Protector Valve
  • Meets or exceeds the original equipment quality
  • Sierra part number: 18-4456
  • Interchangeable with the following: GLM 89240, Mallory 9-44000, Mercruiser 34765A2, 34765A1

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