SharkBite 1/2-in PEX x 1/2-in NPSM Brass Female Swivel Adapter in the PEX Pipe, Fittings & Specialty Tools department at Lowes.com
Brass Push-To-Connect Fittings, Valves & More ǀ SharkBite
Benefits of Push-to-Connect Transition Fittings | SharkBite
Pex Fitting, 1/2" Sharkbite x 1/2" MNPT Elbow, Lead Free | Serv-A-Pure
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. :