I have an 18 foot Formula Vee with a 115 Yamaha Jet and have been flushing it with the adaptor for years. The waterpump gets water with the adapter unit. Do not ever run the motor without the waterpump being wet or you won't have an impeller for long. It does help to use "Saltaway on the jet as well as your aluminum boat , that salt is not good for either.

Ng
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C/R > A good thing > fish all day,into the night! Steve Ng

Dad, think that if I practice hard, they'll let me participate in the SRC ?
[Gig Harbor Puget Sound Anglers....Join your local chapter. CCA member