Buy a Basic Plumbing book for homeowners.
Yes, there are fittings to transition.
Beware of using female adapters; they tend to split apart,
use male adapters.
Do NOT use PVC on Hot supply lines; use CPVC instead.
Check with your city to see if either material is allowed.
CAUTION: Many older homes (up till around 1965) used
the cold galv piping for elctrical grounding.
If you chop it off, all of those grounds to boxes/fixtures
will be lost.
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