SharkBite 1/2 In. Barb x 3/4 In. FIP Brass PEX Adapter - Gillman Home Center
Pro-tip: Thinking of using Pex-A? Avoid Sharkbite (brand) brass fittings (found at some Lowes). The tiny shoulders make it next to impossible to get a proper fit on 90's and Tee's. :
SharkBite Plumbing Fittings: Do they leak? | Waypoint Inspection
3 Common SharkBite Installation Errors & Mistakes to Avoid | SharkBite