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I am just a bit confused. You (or was it someone else?) already plumbed essentially the entire house using Uponor (Wirsbo) expansion fittings. Why don't you plumb the basement using expansion fittings as well? Your post states you are going to use "sharkbite PEX pipe". When I have used sharkbite fittings, they were sold as fittings only, I have never seen PEX pipe manufactured by the sharkbite company. I used the sharkbites where I needed a quick disconnect.
The other thing I didn't quite get is why you are planning to use copper crimp rings if you re using sharkbite fittings. The sharkbites I have used did not need copper crimp rings.
As for where to connect, you could add a T either onto the copper or the PEX. But that looks like 1/2 inch copper and PEX, which may be too small diameter to support both the basement and the rest of the house.
The other thing I didn't quite get is why you are planning to use copper crimp rings if you re using sharkbite fittings. The sharkbites I have used did not need copper crimp rings.
As for where to connect, you could add a T either onto the copper or the PEX. But that looks like 1/2 inch copper and PEX, which may be too small diameter to support both the basement and the rest of the house.