Highest Quality -drive key, or woodruff key
this is pressed into the pump shaft to drive the Impellor / Impeller for the water pump on a Vire 7 or Vire 12
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stainless steel, dont use anything less!
correct size for engine 7hp and 12hp
very easy to lose, so have a spare!
could drop out into your bilges when you remove impellor, so thats why id have a spare!
easy install, if its not loose fit, then it will need pressing in with a pair of pliers, or tap in carefully with small hammer. to remove the old one, you might want to drift it out with a 2mm pin on the end.