Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser drain screw plug (lower gearcase)

GLM outdrive magnetic drain screw for lower unit sterndrives

  • Aftermarket Mercruiser drain screw / magnetic oil plug and gasket for use with marine engine stern drive units
  • Fits MC-1 / R / MR / Alpha drive models
  • Aftermarket Mercury tools for oil plug repair taps are special order helicoils 3/8-16 national coarse thread

21731 drain screw magnetic

21731 drain screw magnetic

P/N 21731 GLM Marine aftermarket Mercruiser oil plug kit OEM 22-67892A1 / 318544 $6.95