Is the copper coming out of the boiler? If so, the rubber O-rings in a Shark bite may not take the heat. May have to go with a conventional brass compression fitting.
YES its coming out of a boiler, i went with one inch at the boiler connection...that way if i ever upgrade the crap one inch thermopex central boiler sold me (too small) to something larger, i wont have to upgrade at the boiler itself. thanks for the help.
You can also get compression fittings that do not need special tools . You just need a screwdriver. They cost about 2 bucks. So if you don't need to do a lot of connections it might be the way to go. You can also remove and reuse this type.