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· Registered
6,655 Posts
When do you use one?
all the time.

How do you know which color? and...
red is 3.125, turquoise is 3.0625, something else is 3.00. most all of mine are bare aluminum, because i make my own, and there is too much spread between the colored ones.

to fine tune the boat??

-generally-, stock cast nozzles are too large in diameter for the application, and they are not perfectly round. inserts are round. some people use a .125 and never change, others use different sizes as part of tuning.
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