SharkBite PEX Crimp Brass Female Adapter Crimp x FNPT (Lead Free)

"Broad line of fittings, manifolds, regulator, thermostatic and ball valves: A typical barb system offers the lowest material cost
Clamp ring connections: The time saving clamp rings and tool offer reduced equipment cost, one tool clamps all sizes and the necessity to check each fitting ring with a go/no-go gauge is eliminated
Crimp ring connections: Copper crimp rings and the heavy duty tool with interchangeable jaws, does not require calibration and allows each joint to be checked with a go/no-go gauge
ASTM F877 specification for crosslinked polyethylene (PEX) plastic hot and cold-water distribution systems
ASTM F1807 specification for metal insert fittings utilizing a copper crimp ring for SDR9 cross-linked polyethylene (PEX) tubing"