We are trying to install a water system in our home and need to know how we go from copper pipe to pvc pipe.

Try these. (http://www.cashacme.com/sbpush.php)

Or this!

Tom's sweat fitting is much cheaper. A 3/4 Shark-Bite will not fit a 3/4'' PVC pipe. 1/2'' PVC is much closer, but I can't say if it would work. You could compromise and use a Shark-Bite to thread adapter. You also can go Shark-Bite to CPVC to a CPVC/PVC adapter. Use a cement meant to work with either.

I have used CPVC compression unions. With them, it is best to anchor the pipes solid.

Or this!

Other way around, Tom.

When joining threaded plastic to threaded metallic fittings the plastic fitting should always be the male fitting -- Otherwise the plastic female fitting will crack during normal expansion and contraction.

Section 606.2.2 of the UPC.

I have used CPVC compression unions. With them, it is best to anchor the pipes solid.

Compression unions are fine, but only in accessible locations.

Burying them inside walls is strictly forbidden.

Other way around, Tom.

When joining threaded plastic to threaded metallic fittings the plastic fitting should always be the male fitting -- Otherwise the plastic female fitting will crack during normal expansion and contraction.

Section 606.2.2 of the UPC.
OK! Turn the thingy around then.

OK! Turn the thingy around then.
:D