i replaced a oval window because the plastic hing broke.
the window do not have a gasket to the hull, its just calked in.
you should first just calk it, and see if that works, with a garden hose.
spray it low, wait for leaks, then move up to the top after a few days and test it.
if you replace the whole window, you'll have to pry the collar out of the hull, and then re calk.
mine was a whole unit for $200 bucks.
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