Midland Metal 7045618 Adapter, 3/8 in FPT x M18 Male Metric, Steel

Adapter, Connection Size 1: 3/8-in, Connection Type 1: Female NPTF, Connection Size 2: M18, Connection Type 2: Male Metric, Steel, Thread Size 1: 3/8-18, Thread Size 2: M18 x 1.5