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Johnson outboard drain screw *Magnetic

Magnetic outboard drain screw with washer

  • 3/8 inch N.C. thread Johnson / Evinrude outboard drain screw magnet picks up iron filings in oil
  • Paper style washer / gasket (included)requires aviation gasket compound for complete seal when pressure testing at 20 lbs.
  • Nylon washer only requires a coating of grease or oil for perfect seal at 20 lbs.
  • Helicoil thread repair kit is available for stripped threads (#5401-6) which includes drill, high speed steel tap, installation tool and 3 lengths of inserts.
  • OEM 318554
  • Exploded view lower unit Johnson drawings

21731 drain screw

21731 drain screw

P/N 21731 Lower unit drain screw OEM 318544 $6.95